I know this thread is old, but in case someone else stumbles across it:

To find matches: check out a website called “practiscore”. You can search matches by area or type. It even has a map.

You can also check with local ranges. There are some indoor ranges in my area that offer non-sanctioned matches twice a month. These are very beginner friendly matches.

Look into Steel Challenge. Its probably the best format for getting started, and meeting other competitors.

Google some videos of match etiquette/procedures/safety/commands. Knowing what to expect of range commands and the procedures of a type of match will make your first match go smoothly. Safety is most important. You won’t be kicking any butts your first match, so just have fun an be safe.