I'm in the same boat - I have an IGO-W staring balefully at me from the shelf, unused, and I have the wire, and cotton, and an Ohms checker.
I don't have a mech yet, so my plan is to start with a 1.8-2.0 wrap, on my SiD, and once I'm more familiar with the process (there's not a lot of room to work in there!), try a double coil at 2.0-2.5 ohm. I've read that it's hard to get over 1.6 with 28g, as it takes too many wraps. I got spools of 28 for sub ohm later on, and 30g for playing with now, from what I've read and seen in videos, I should be able to get a coil to 1.8-2.0 with 10-12 wraps.
I think I may go get a sample bottle of something at 6mg of nic, a lot of people comment that anything higher on a RDA is a bit much. I have some 12, I could try that, too.