Also please do not be intimidated by everyone. It always comes across wrong in forums. You can also just message an individual if it is easier.
There is help here , it is just not always easy to get to.
As @NashansCamos said, T5HO bulb and fixture. The prices run odd, as in the smaller ones are often more expensive, if can I would get 36in over 24in, but either is good.
Do some shopping, Look for theese "arcadia shadedweller prot5 uvb kit " I see 12 in, thats too small, But I have a 48in so they make them. The key here is these are the only ones I have found that come with correct light. You get to pic what bulb you want.
Here is a link https://www.pangeareptile.com/store/arcadia-prot5-uvb-kit.html this one is 36 in for $64 That's bulb and fixture. Any other fixture I have found you would need to by the bulb separate