A few hundred dollars in food the first year alone, several hundred to several thousand in cages the first year alone, potential for vet visits for it and doctor visits for you that are a few hundred to a few thousand. Unless you have a full time job or own a sucessful company you wont be able to properly care for large monitors let alone medium sized.
"are they a nice if u handle them a lot as babys i heard they are like dog tame?"
Depends on the individual, you could also lose body parts.
"also im probly not going away for college so i could take czare of them"
Will you be making enough to care for it and yourself?
"and wat its the diff between a white n black bc i cant find like any info on black only white"
The V.Albigularis is a "whitethroat", the ionidesi was combined with albigularis, now the true BT is a microstictus which are very rare in captivity. So the BTs we have except a few rare cases are really WTs according to those who write the books. In the pet industry BTs are still BTs to make them easier to identify.
Oh by the way my fiancee couldnt properly care for my large monitors because they are too strong for her, and I somehow dont think your mom will care for a monitor after you leave.