Putting my feedback in red.
Disclaimer: if I sound harsh or critical, I’m not meaning to. Just gonna give you the corrections needed. 
This is his enclosure, I am getting more branches and plants and a Dripper but they were out of them when I got him so I have been misting his enclosure 4-5 times a day. I have been reading articles for the past week and thoroughly considered all things before getting him.
he is a male, veiled, 4 months old, and I have had him for 3 days now.
I have not physically touched him yet but have tried to put my hands in his enclosure so he can get used to my presence.
Is better to just open the enclosure door and sit quietly, moving slowly to get him used to you. Putting hands in his enclosure is frightening as that is ‘his space’.
I am feeding him large crickets (that’s all they had at my pet store) but he has been eating them well.
He needs smaller feeders and more variety. Attaching feeder and gutload graphics for you. About 5-7 a day and I gut load them with carrots, romaine lettuce, and cucumbers
very little to no nutritive value to pass on with these. and dust them with just a calcium powder at every feeding.
Does the calcium have D3 in it?Basic supplementation is phosphorus free calcium without D3 at every feeding except one per week. That one weekly feeding you want to use calcium with D3 one week and the next use a multivitamin. He eats the bulk of them at 9ish in the morning but whatever he doesn’t eat I leave in his enclosure and he will eat within the next few hours.
I’m cautious about leaving crickets in an enclosure. He may not eat them all and they can give him a nasty bite when he sleeps. Good way to prevent this is by leaving a little something in the enclosure for the cricket to eat...a piece of greens, veggie or similar.
for now I am misting him 4-5 times a day for about a minute each until everything is dripping although I haven’t seen him physically lick any water, his urine has been white and he does not show any signs of dehydration.
Is better to mist 2-3 times daily for at least 2 minutes each time. Many chams are secret drinkers.
his droppings have been normal, he had the white creamy urine come out first then a dark brown dropping right after that with (from what I’ve read) the right consistency.
It’s always a good idea to have a vet check a fecal for parasites.
he is in a full screen cage that’s about 2 1/2 foot long, 1 foot wide.
Too small and will need to be upgraded within a couple of months to a minimum of 2x2x4’ (Or equivalent).
I am using a 100 basking lamp and uvb bulb that covers the width of the back of his enclosure. He has a timer for 9am-9pm the lights are on and the remaining time at night they are off. 12 hours on and 12 hours off.
What type of uvb is it? Do you have a T8 or a T5? What is the strength of the uvb bulb?
his basking spot has a separate thermometer that ranges between 80-86 during the day and doesn’t drop below 70 at night. The thermometer at the bottom of his cage ranges between 70-75 during the day and doesn’t drop below 65 at night.
Need to be a bit cooler during the day. Try to keep it around 80*. At night you want a temp drop and veileds can handle temps as low as the 50’s! Good that you’ve got different temp gradients.
He has no live plants.
He needs some! Pothos is excellent, as is wandering Jew, dracaena, schefflera. Here’s a list of safe plants. https://chameleonacademy.com/plants/ The problem with fake plants is that veileds tend to nibble their plants. He may eat a fake leaf and get impacted. I use the fake plants I started with attached to the outside of the enclosure door to give a better sense of safety/privacy. You also need many many more branches and vines. All of that empty space is wasted.
his enclosure is not near any vents and sits on top of my mini fridge so he is above my head in my bedroom, there is little to no traffic besides for just me.
The higher, the better. Chams feel safest when they can look down upon their world.
I am geographically located in Alabama.
my concern with him is getting him acclimated to me. And if there is anything I need to change to make him more comfortable, like I said I am a first time owner but have owned many other reptiles and pets, I am going into vet school so I’m used to animals and truly want the best for him, just need some help starting up with him. Is there anything I should start doing daily to get him used to me and maybe limit the hissing and trying to bite?
It’s going to take time and patience. There’s a great blog on building trust with your cham. https://www.chameleonforums.com/blogs/building-trust-with-your-chameleon.2396/
As others have said, get rid of the substrate. Bare floor is easiest to keep clean.
