Hi there
When you post TBB1 make sure that you cleared the test run field, then check in TPM20 if the transaction has been posted. If the entries show up then TPM10 will also do the reversals.
By the way you are asking a lot of basic customizing questions and I think it would make sense to go to the SAP training FSC110 to learn the basics. SCN is not a training environment!
Regards
Juerg Heiz