CRM7.0 Technical (ABAPer)step by step guide for beginners

Hello Experts,

I am basically ABAP developer and I would like to learn CRM7.0 Technical .

Please suggest me some good documents and I will go through the stuff.

I really dont know from where to start and it all connfusing .

It would be great if someone can provide me step by step materil on CRM 7.0 technical

and also aprriciate your suggestion on what to start first and other things.

Thanks In Advance

Best Regards

Trupthi