Hi Houshyar,
1. The client always go with Z Application Object types and Z Event types (if not, please do not remove SAP standard ones that is not recommended approach because you can refer in future). If it is Z, then you can go to above configuration path said by Vishnu and remove all Z event types those are not required.
2. Setting up new even types, it is full configuration and little bit tedious job. Please check below documentations to indepth idea. You can post questions here when you stuck up on configurations to help you to complete configuration.
SAP TM -> SAP EM configuration:
http://help.sap.com/SCENARIOS_BUS2012/helpdata/EN/CC/EF6891DBCB4CF59ECC8BC77E680528/CG_TM_EM.pdf
Visibility Process in SAP TM -> SAP EM
Scenarios of SAP TM -> SAP EM:
Regards
GGOPII