well, you came to the right place if you want to learn DOA5U. a lot of good players also reside in this thread alone. there are tabs up at top and the "forum" tab is where you can access pretty much anything you want to know about a character. there are several threads dealing with different scenarios for each character. these Threads are created by the players themselves so depending on how dedicated the players are or how many people play the character will make the number of threads vary.
now i don't know exactly how Tapatalk works, cause i just browse the default web layout on my phone. Also where are you in Southern California. our scene here is still very much active and we normally even get together once a week to play casuals. even if you can't drive or don't have a way of getting around people can make an effort to pick you up and offer a ride.