Greetings!
Congrates on your new baby! Since you have a 4' tank I am figuring that your tank is around 45-55 gallons. You can use a 125 watt exoterra solor glo (this is a Merc vapor bulb) MVB are really the best source for UVA and the Very important UVB. the mentioned repta sun 10.0 is alsp a very good blub (repta-glo 10.0 is dangerous) and again stay away from the coil bulbs as they can cause eye problems and blindness. Keep him at least 12" away from the MVB. If you use the MVB, you can use just a plain 60 watt household blub in the other end of the viv for added light. If your area gets colder, you can also get a Ceramic heater. I am in Seattle, so I use a MVB on one end Ceramic heater in the center and a 60 watt blub on the other end. Here is a pic of my viv, just so that you can get an idea of lighting set up, it is 4' long too and it is a 50 gallon:
Ive got the MVB on the far left, the Ceramic in the center and the reg bulb on the end. (BTW this looks like a coil bulb, but its just a reg house hold energey efficant bulb, it had no UVB or UVA emition) I had to put my Heater into a dome fixture, because it is colder in the basment where judah is, and with fall the temps started getting to cold in there for him. Normally it is recomended that you use a wire ficture for these Cer. Heaters but you can actually use them in the properly rated dome fuctures that have to cover.
For feeding options visit beautifuldragons.com this will give you a good list of what to and not to feed. Again babies will eat mostly protein form crickets etc. but are very picky about eating their veggies. You can also try some organic babyfood such as peas, carrots, squash etc. Just be carful about feeding too much of sweet stuff liek applesauce etc. those have too much sugar and can be bad in excess. You can feed the babyfood in a Baby med syringe (as much as he'll eat) mix with a tiny dab of Vits and Calcium. I use Sticky Tongue Minerals, note that this has a bit of calcium along with D3 so you'll wana feed this one every other day in 1 feeding (just a pinch) and a Calcium with out D3 Such as Repta Cal, everyday until he gets about 8-9 months old then you can cut back. If you have the proper UVB and a good diet, as they get older they dont need too many supplements and these can often be over done. Thats is why I recommend getting a calci with out the D3 if your using the Sticky Tongue.
You can get great clean crickets from Reptilefood.com. You ahve to be very carefull where you get your crickets because they can be diseased from retail pet stores and they can make you baby sick. Keep your crickets in a large plastic storage tub, (with proper ventilation in the lid) you can actually start your own little habitat. I actually had another plastic tub to put Judah in for feeding, and then dust the crickets with vits and put them in there and let him go to town. It keeps the crickets out of the Viv and then you dont have strays that can munch on him. You never want to leave crickets running around in the same viv as your baby, they can munch on him while he is sleeping. Having a feeding bin for him, aside from the cricket bin, is a great way to feed your baby with out having to chase crickets down in the viv. It also is so much easier for them to catch them, since they dont have to case them down too much.
Lots o info! hope this is helpfull!
Stacey