If he's your first I'd seriously wait a bit to see how you get on with him before going all out... the frogs if purchased individually from different sources will all need to be quarantined for 1-3 months before adding them to a main collection as well, to avert potential disaster from disease/parasites, etc.

Yes. There are many brands of supplement powders available. I use Reptocal with calcium/D3 and Reptivite multi-vitamins.