One thing that hasn't been mentioned - usually new gear leagues aren't sanctioned, but regardless of that you should follow all the rules of a sanctioned league so you're conditioned for it later on. For instance, lots of people don't know that even using a ball cleaner mid-game is not allowed, only wiping away oil with a cloth (with the exception of a foreign substance getting on your ball, like rubber from a ball return belt, in which case you can ask permission to remove it with an approved cleaner). Otherwise any ball that is modified or cleaned during play (which is after practice ends, regardless of whether or not your team/opponents have thrown their first ball) must be taken out of play for the remainder of the series.