Hi Sandra M,
Welcome to BiggerPockets, (and happy Mother's Day if that applies to you.)
You bring up some very good questions and concerns here:
1.) The bay area is nice, but very expensive. We are also seeing a bidding war here in southern California since inventory is so low. It's just crazy. But as I always like to say, "Live where you want. Invest where it makes sense!"
2.) Congratulations on your first investment. The rent to value ratio is good, but I hope the expenses, particularly the property taxes, aren't eating up most of your cash flow. The issue I have with most of the coastal states are the high property prices.
3.) I'm a big fan and advocate of buy-and-hold investing. It's all I've focused on since 2004 and it's what I 'preach' to my clients. So, congratulations on your decision there.
4.) If you have good credit, as you've mentioned, then it shouldn't be hard to get financing. Our investor clients are getting loans on their properties with 20% to 25% down (maximum leverage) and generate very good returns. Therefore, if you have the ability to finance (leverage) your investments, you'd be able to buy and control more real estate, and that should serve you well in the long term as your equity builds across multiple properties.
5.) As far as your next market, I am not a fan of California. There are many great markets all around the U.S. Many with property prices below their replacement costs. You want to look for a stable or strong housing market, good economics, lower unemployment, and job growth, among other factors. I've posted many of my favorites on my website.
Feel free to post any other questions you may have.
Continued success!