Men's size 13 skates used

Hello: against everyone's advice I'm going to take up skating again, after 40 years. Never was an expert but did skate and enjoyed it. So everything I knew is probably wrong now. How to begin? First of all, where can I find good quad skates in my size (men's 13 narrow)? 13 medium width will do; I'll just wear thick sox and lace them well. Used of course. I'll need padding (think Michelin man!). Not only that: how can I connect to other skaters in my area? Zip 94903. This may be a bad idea but I so want to try it. I'm already fairly fit, so let's do this. Any and all advice will be appreciated!