Two helpful links for sulcata care:
http://www.tortoiseforum.org/thread-63788.html
http://www.tortoiseforum.org/thread-52524.html
A UVB will last 6 months or until your UVB meter says that the output has diminished. Or, if the tortoise can be outside at least 20 minutes a day, skip the artificial UVB and just use the sun. Tortoises can develop eye injuries including blindness when compact fluorescents are used (the coil bulbs) so only use tube-style bulbs or mercury vapor bulbs (MVB).
The 10 gallon is way to small for the temperature gradient and furniture you need for a baby. Note I didn't say too small for the baby, they're tiny. But it is too small to have a cool side in the high 70s/low 80's and a basking spot with a surface temperature of 100+ degrees. And you need a hot-side hide, a humid hide in a spot that stays 80 24/7, a cool-side hide, a shallow water dish (plant saucers work well), and a piece of slate to use as a feeding station.
I have used concrete mixing tubs, 3'x2', for smaller tortoises without issues. They've got lots of room for little tortoises, an appropriate amount of space for gradients, and cost less than $20. Make sure to add a couple inches of substrate that is dry on top, moist at depth, to help keep your tortoise from dehydrating. Cypress mulch or a 50/50 mix of soil/sand work well. I like to use a hodgepodge mix that includes cypress mulch, orchid bark, soil, sand, sphagnum, and leaf litter.
Good luck with the little one, they're fun tortoises. I live in 'cold country' too so you'll have quite a challenge on your hands in a year when you need to build the heated barn outdoors.