Well, as WW mentioned, getting cobras and then asking how to care for them isnt the best idea but since you have them, heres the best way to keep and handle them that I have found.
First, as WW mentioned, a locking cage is a must!!! He is also dead on about a Monacleds strike. They dont do the up thing very well. For a new keeper, a fashioned, lockable, deep top opening cage is probally the safest bet but once you have more experince as to how they act, getting a front opening Neodesha is probally the best. WWith my two specimens it seems the typical glass top opening cages lleave then too exposed and they usaly stay kinda pi$$y. Giveing then a secure wall, which dosent show a refelection like glass would really has seemed to mellow mine out a bit (though not much!! Hissy little ingrates
This way, if they start getting stressed you can simply cover the front with news paper and they wont be temped to strike your reflection thats sneaking through the areas not covered. Trust me on this one
Ok, as for typical Naja kaouthia husbandry, it is a must that they get the proper humidity!!! Monacled are renouned for haveing bad sheds if they dont have proper mositure and there have been many a session when I had to tube my pi$$y 5 ft male inorder to remove retained skin. Not fun! To counter this, give them a very mositure retaining substrate like some sort of moss (peat works good)or cypress mulch and provide a large water bowl that they can soak in if they so choose. My female monacled spends days in her water bowl and really seems to enojoy it. Beacuse of this, she has never had a bad shed!! (Thank god, shes worse then the darn male!)You can use newspaper as well but in that case, definately make sure the water bowl is large enough for the snake to soak in and keep a close eye on how dirty the newspaper gets. Monacleds poop ALOT and you will need to clean the cage atleast weekly if not a few times a week (depending on how much you feed them). With substarte,, you can go alittle longer but you must still spot clean. Also, mist maybe once a week to make sure the humidity is up.
Ok, on to feeding. This is far and away the most dangerous part of keeping Naja. Cobras get so worked up when they smell food that any movment is considered prey and THEY WILL try to chew on you!!! There are a few ways to get around this. One of the best ways is to utilize a trap box and before feeding, make sure they snake is in the box! Shut the box, place the food on the box or infront of the opening, carefully use a hook to reopen the box and close the cage.
Another good method is to use a transfer bin. Place the food items in a trash can or large, lockable rubbermaid type containor, then hook out the snake and place them in the containor as well. Let them do their thing and then transfer them back to their cage. Make sure to watch it though when you reopen the feeding bin!! They will stiill associate movement with food and may try comoing after you. Usualy if you can get a hook under them, they relize din din is over and turn back into their normal selfs, usualy!!
Ther transfer method has been claimed to help in sort of trainig cobras in that they wont associate you opening their cage with feeding time. Personaly I think they will associate any movment with food, especially when your talking about some of the larger African sp (Blk necks and Eygptians are real bad!!!)However, you kinda of throw themn off their game by removeing them from their normal element, I.E their cage and when out of their element, they usaly act more defensive then offensive. For me, a hooded cobra is a good cobra. Its the times that they dont hood that I worry!! (like when feeding!!!)
As for how often to feed, for neonates and juvis I recomend every 3-5 days. Cobras have very high metabolisims abd sometimes poop the next day after a feed!! For sub adults to adults, once every 7 days is good and for large adults, dependng on their weight, every 2 weeks can work. Monacleds get pretty chunky for cobras and you dont want them to get obese. Just moniter their weight and take the appropriate action when they get that large. BTW, getting a baby moncled up to 4 ft in their first year isnt that suppriseing at all so make sure you are ready to transfer them to larger houseing!!
Handleing cobras is much different then handleing vipers/pitvipers and you should be ready to use the hook and tail method once the get about 3 ft. They sometimes stay on one hook but the only way to really keep control of them in to grab their tail and keep them in place. The two hook method dosent work at all and kinda makes you clumsey since you have to hold another tool. The best way to go about hooking and tailing is to hook the tail up to your hand and then hook them about a third of the way down their body, from their head. Try not to allow them to sit any further down the hook then that for if you give then enough slack, they can hop back up to your hand and then you will be doing the fabled Cobra waltz!!!! For really high strung or aggresive specimens, useing a trap box is the ideal way.
Now since you said you have kep[t vipers and pitvipers I wont mentioned tubeing and other basic hot hunbandry techniques.
Be very carefull and try to located or better yet obtain you own AV incase the worst should happen. Monacleds bites are VERY BAD and you get a full punch of both hemos and neuros!!! Make sure to have atleast an epipen and presure badage on hand at all times.It also wont hurt to have some Benidryl incase of an allergic reaction(though that the reason you want an epipen in the first place)
Welp, I hope this helps ya. Off for my morning coffe now. Please excuse the many typos im sure ive missed.
Good luck and be safe,
Jeremy