This thread might help you out a bit too with picking some comics to read.

In addition to the reprinting of the US comics, IDW is also reprinting all the UK comics, but the better UK stories (in terms of art and plot) will appear from Vol 2 onwards.

Or you could wait until the Chaos story starts and the two new ongoing series start after issue "#125", but there's little detail about those two books. I think one is going to be set in the early days of the war, but there's no confirmation yet.