How I got started years back was with the Normal/Hi Yellows, Albinos, Jungles, & Patternless which I sold mainly to pet stores. I was pretty successful at the time & would have animals spoken for befor they hatched. But when I decided to get into some of the more expensive morphs Hypo Tangerines, Pastels, plus some others but things backfired & petstores didn't want them just based on the price. So between that & some of my best customers going under I then started vending shows & over the internet. It's actually a real long story, but that is kind of the short & sweet version.
When it comes to the displays for shows, all I use & what alot of the other venders I see do, is use the 6" display deli cups. I put as many that will fit on the table & cover them with bird netting. It sounds tacky, but it actually makes a nice display, easy to work with, & very cost effective. My philosiphy is the booth, hotel room, gas, & other trip expences cost the same weather you have 20 animals on the table or 100, so get as much variety on there as you can.
As for what morphs to work with, I'll give you the same advice as I do others. Work with what you like, it's your hobby. For the longest time I would focus on what would sell or what was popular & I ended up with too many animals which some of them I didn't really care for. I eventually had to just do my own thing to prevent myself from getting burned out. Just like I said earlier, go for a variety. If you vend a show with only one or two morphs, you will only sell to people interested in those morphs. With more selection, you will appeal to more people. Also look at what other local breeders are into. Then I would shy away from those morphs(unless you like them) & get into the ones they're not working with so you can offer something different then the others. In a nut shell, it's more about what you like.
Another tid bit to think about, you sound like you want to keep the number of breeder animals down to a minimum. So I would set my colonies up to produce as many different morphs from one colony as possible so you can still get variety. An exsample is one of my trios is a Albino Jungle male & the females are a Jungle & a Reverse Stripe which both girls are het Albino, So from those 3 animals I get Jungles, Reverse Stripes, & Stripes that are either Albino or that are normal color & het for Albino.
I hope this helps & I'll try to get to other questions you have when I get a chance. Good luck.