You might want to look at cboe.com, and their training. Lots of webinars on the IC.
Some basics:
1. There are two types of IC, low probability and high probability, depending on how close they are to the underlying price. Use common sense on how wide the spreads are.
2. There are several ways of adjusting.
Those are the basics. Everything else relates to where you want to place the IC, and at what point you make adjustments (or take profits), so focus your training on those two points.