Configuring most server connectors should be straightforward, even in MyEclipse 10. Can you tell us what problems you’re running into and the exact version of WebLogic 12c you are trying to configure?
Given that MyEclipse 10 is over 10 years old, it’s possible that recent Weblogic 12c releases will not work with it. Our recommendation would be that you use the latest release of MyEclipse, version 2020.9.16 instead.