Are you building your own rack? What are you planning on using for the shelving?

Rack setups are pretty easy, but you probably won't be able to find everything you need in a physical store.

A good reptile thermostat is hard to come by in an actual store. I would recommend buying one online. I'm a big fan of the herpstat.

As for heating, most people use flexwatt because its cheap and sold by the foot. You can use regular heat mats, but it will be much more expensive.

Tubs are totally your call. I prefer the ones that don't have many groves on the inside so they are easy to clean.