Commerce Kikstart rules how to
It's hard to say, what your problem with Commerce subscription products is, without more detail.

Randy Fay have made a lot of screen casts about Commerce which also include configuration about Rules. You might be able to find a more better tutorial on Rules, but Randy does a really good job on stepping through different tasks in Commerce. There isn't a screen cast about subscriptions, but you should be able to get a lot of help from some of these anyways.