New Coin Photography Set Up

My first post on this forum. The forum has already been tremendously helpful and fascinating reading through the various posts.

I'm setting up a basic system for photographing some of my coins, and although I don't expect to get the phenomenal results that I see here, I'm wondering if I can get by with the equipment I have. I plan to use my Nikon D90 on a tripod, with a Nikon 18-55mm kit lens on a reverse macro adapter, and a light tent with two light sources.

I assume shutter speed won't be an issue using a self timer on the tripod (or is that incorrect?). Does anyone have any suggestions on the best ISO setting, and the best F-stop to use to give an acceptable DoF (presuming the photo is taken at 90 degrees)? Also, any hints on lighting angle for uncirculated silver vs circulated copper coins? Thanks in advance!