Using EnterpriseManager and Enterprise for existing user data base

Using EnterpriseManager and Enterprise for existing user data base

  
Hi,
I have an exisiting user data base tables (not created by Enterprise or EnterpriseManager). I want to build new applications by using EnterpriseManger and Enterprise template. Is it a good idea to use Enterprise template with exisiting user database or it is better to build from scratch?
Thanks,