For your question three, if you need help with working out how to convert GRPs into BMPs and vice versa, take a look at this tutorial, it'll be quite relevant:
http://www.staredit.net/index.php?tutorial=208Something I didn't describe in that post about waits is, one way you can think of waits is, it's more like "Wait for x screen redraws." It's because this is all to do with animation. If it helps, use a different word for "wait" here, because it's not the same as it is in triggering.