You must be very patient when trying to contact your guides, they come through in very gentle ways, you have to "fine-tune" your own sensing abilities to finally get it done. I would try automatic writing, where you just sit down with a pen and paper and write a question to your guides and then as an answer put down the first thing that comes to mind, even if it feels as if you're making it up. Just start writing... and then answers will just flow out of you. I use this method myself with much success, but in the beginning it wasn't easy, I had to practice alot.
Keep the faith and hang in there.... you'll get it eventually.