If you have clients -- as in work to do and clients to bill for it -- you can get going very fast.
I'm not an electrical engineer, but I have to assume you can start your own business as an electrical engineer for hire, as a consultant, without needing much more than your expertise and credentials. Will your business require equipment such as a computer? Will you need a marketing budget? You might, but then again you might be able to start your consulting business simply by calling a few contacts and getting hired.
Also, put yourself on Facebook, LinkedIn, and Twitter, if you haven't already. Those are all free avenues for finding customers.
Related: Deciding Whom to Ask for Money
Related: How to Keep Family and Friends Loans Strictly Business
Related: How to Approach Lenders Now