New Here Tire/Wheel questions

Hey all, new to this forum. I've had my 02 explorer 4wd xlt 4.6 for 5 years now and its been great to me. Also have a 2003 mach 1 5spd lightly modded. Im looking to get some new wheels for the explorer in 16'' I want to go for black wheels. What's the best width wheel and what do I need for backspacing and all the other crap I need to know for getting a set? Also who has the best reasonable prices on wheels? thanks