What do I need to start using RDA's

I'm using a crown 3 on an og Sigelei 150 that is starting to have issues (it's not always firing when I press the button). So I'm looking to get a new mod and I figured I would try out an RDA as well. Since this is my first time using a Temp controlled mod I was wondering what type of wires I'd need and the tools I should get in order to safely build on the RDA. Also what watts do people tend to use with RDAs? I'm using 80-85 on my tank and liking that, but I don't know if it's going to be different especially with temperature control.