4x2x2 viv, they need high uv (t5 12% is considered the minimum these days). They work really well in a sandy bioactive viv. They need to be able to get within 6-8" of the uv source (no closer) and a basking spot around 40-45c.
Usual requirements on being able to thermoregulate AND photoregulate-that is to be able to get away from the uv source also.
I keep a Timon lepidus (way more interesting than a bearded imo

-see my 'Meet Julius' general lizard forum for more details) and their care is similar. I use an Arcadia D5 uv light which is compact but very powerful so it allows very high uv at one end of the viv and much less at the other.
You would normally have the highest uv concentration at the basking spot also so the lizard gets max uv whilst basking which is pretty much what would happen in the wild.
Diet is the usually crickets, locusts and roaches together with green veg dusted with a suitable calcium supplement most feeds and a broad spectrum vitamin supplement one or twice a week.
Do not cohabit them and do not breed them. They are thoroughly overbred and most are purchased very cheap and poorly looked after.
Remember the purchase cost of a correct setup will far far exceed the cost of the lizard as will the ongoing electricity bills and food but that is true of most lizards these days.
Also, whilst many become insanely tame they should not be out of the viv for any more than 30 mins at a time really. They need that high uv and heat and letting them chill around the house causes long term harm.