You join the club fish together and have club tournaments which have another entry fee (usually ) ,and you can learn a lot from these people about local bodies of water and catch some nice fish !!
Hookingem - For me when i pre fish usually i am basically just fishing , looking for structure,drop offs, and point. Basically learning the lake when i establish a pattern i keep it in mind but usually in summer months the fish are moving and chasing bait so much its hard to fish a pattern that worked two days ago but pre fishing does help with learning the lake and marking way points such as drop offs , points, and structure that they may be sitting on or will be when conditions change but my experiance is when i find a pattern pre fishing if i get stuck on it during the tournament i usually dont do to well .
honestly you will find what works best for you we are here to guid you in the right direction .