Steve is 3 1/2" he is about 92grams he is a sulcata tortoise his enclosure is one I purchased from Mark on this site it is 48x36 and is a complete setup. Highly recommend if you don't want to get flustered with building your own. Feel free to leave an advice on substrates plants I can add and any other care advice. Steve current diet is cactus kale dandilion leaf roman hibiscus leaf I rotate evey other day (3 of a kind) he also sometimes will eat the mazuri pellets.
Orchid bark or coconut coir is the best substrate for holding humidity. The combination of the two with coir on the bottom woukd work great.
Pothos plants, is a safe plant. I can think of any others right now. Maybe others will have ideas.
Any weeds you have that are safe you could dig up and plant in the enclosure too