Lightbrite: there are many minhagim. Some single girls light one. I used to light one, until someone told me that I’m not supposed to, so I switched to two. I’m not sure if they were correct or not.
There are definitely minhagim for lighting more than two. I once saw a list of all different minhagim. Usually married women either light 2 or one for each member of the family, and single girls either light 1 or 2.
It never occurred to me that there could be anything wrong with lighting more. When I was living by myself, I sometimes lit a bunch because I was lighting tealights and I felt like 2 tealights was too little light. I thnk I also thought it would be a segula for getting married :).
Maybe I’m wrong though, so you should probably ask a sheilah before you light more candles. I know that it is a problem to light less than you usually do (so if you usually light 2, it’s probably a problem to start lighting 1).