Im only a beginner and people on here with a lot more experience , I can only give you mine.
Are the exo terra terrariums suitable..? I thought to small, I got bigger one from start so didnt have to buy another later, 4x2x2 with sliding front doors, $190
What substrate should I use and is readily available without taking from the enviroment..? I used tiles, can use sand,
Climbing... How high..? I just have rocks for basking under light
What plants should I use (if any) that are not harmful to Bearded Dragons..? I dont have any plants
Who should I buy my Dragon from, People on here
Food... Where can I buy insects from.. powder for sale on trade me, insects from same or bio supplies