The 2 first things I would do are to;
1. Speak to a lender to find out what you can afford.
2. Familiarize yourself with the Berkeley rent control laws.
Berkeley has very stringent rent control, and that may affect which properties you are going to make an offer on, especially if the building has tenants.
After that, find an agent you can work with, and move forward. But those 2 first steps will be your foundation.