First think of this what is the biggest cage you can provide?
You dont need uv bulbs, just a few 45 to 90W halgon flood bulbs from homedepot that will give you a 125+ F basking spot they need. As adults they will need at least a foot to 2 of dirt for digging/burrowing and around a 8x4x4 cage.
For feeding Savannahs are more insectivorous try and give a more insect diet then mice. You can start out with crickets,pinkie mice,super worms, silk worms, horned worms and lobster roaches while young. When they are near adult size it will be hard to feed them alone on insects so you can add adult mice,fish and quails or chicks to their diet. Also you may want to start buying a few species of roaches to breed as they will lower the cost to feed them as well as any other animals you may have. Madagascar hissers and dubia/dicoid roaches are good for adults.
heres some hissers my argus and crosses dont really take them that often but savannahs love them.


for bulbs these are 2 (45W or 90W) haglons bulbs that are about 12 inches away from basking spot


Also check your PM i sent you something

Bryan