Can Anyone Tell Me Something About Jail?

Can Anyone Tell Me Something About Jail? I'm sending $40.00 & I think they have to take money out. What all will he be able to buy with that small amount? As far as paper, stamps, envelopes & phone calls? & also If you might know how much time someone will get for carrying a gun, under 20 gram's & suspended license? His record is clean. Any help would be very appreciated.