I suggest you read the IG codex a couple of times, and then try to make some sort of a list with this (note that you do not have enough models to make a legal army yet, but you could make a platoon - a single troop choice) Also think of some things you'd like to add to your army.
If you have any questions, for example on how a platoon works, just post them, and we'll be more than happy to help
Oh, a platoon works like this:
- IG Infantry platoon (1 Troop choice) -
Command squad with a Junior officer taken from page 38 of the codex
2-5 infantry squads (+remnants if you wish) taken from page 44 of the codex