Start with a Red Cross basic first aid. Beyond that, I Would Recommend a First Responder course. I'm not sure how many hours it takes today, but not that many years ago in Minnesota it was only 24 hours. We used to offer it in one of three programs: Four hours a night, one night a week for six weeks, plus one test night; Four hours a night, two nights a week for three weeks, plus one test night; Or, Friday evening, Saturday and Sunday, all in one weekend and done. Well worth the time spent for the extra you receive. No need to refresh you license, because the info will stay with you.
In my years as an EMT and as an instructor for many areas of emergency services I learned it is the refreshers that burn people out and not the initial training requirements. That is what keeps me from getting my part-time law enforcement license today. I have everything in place, but I do not want to tie into CPR every year, First Responder every two years, and the continuing ed requirements for a skill set that isn't that complicated or changing.