Yeh I agree with @Australian , That's how i started off , by just getting images off Google etc and try to edit them and also look at YouTube videos or you could try and find PSD's and start editing them jut to get the basics.
If you need any help PM me and I'll try and help you :D
I've owned the Xbox 360 and PlayStation 3 since they came out and they are both great in their own ways but i prefer Xbox 360.
I think between the Xbox One and PlayStation 4 that the PlayStation 4 will be a lot better than the Xbox , looking at the announcements and reviews etc I'd say...
These are just a few of my banners I have made !
I'm wanting feedback on these banners because if I get positive feedback etc , I may do a banner service for free :D
If you want to see more of my banners , Please ask for my imgur link !