alors, to run ERP5 easily it is best run on SlapOS, our deployment tool, which also should work on a local machine.
To install/setup SlapOS, please follow the steps outlined here:
Once you have SlapOS and its webrunner working, you can follow the steps outlined here to compile and install ERP5:
How to install ERP5 on a Webrunner.
Also have a look at the developer documentation and especially the
howto section, which includes a lot of useful
Let me know if you have any other questions.