Urgent help reqd on CRM tables/FM/BAdI

Hi Everybody,

I'm new to CRM, though old to ABAP. Need some help on the following:-

1) CRM tables and their relationship too (esp. contract, order, billing, iBase, counter & realted to UBB).

2) Enhancement of BAdIs.

3) Setting actions (esp. sending forms at trigger).

Also, my mail id is debz21at@yahoo.com.

Regards,

Sanj.