tournament in a nutshell: prepare to be upset. liz doesn't have much of anything (but sp. and damage.) most of her attacks are not good at what they are supposed to do and are situational, making her -extremely- matchup dependant - often with the matchups not being in her favor.
as a casual player though you may find that 5c, 5d, and 2c are your breads and butter for pressure/mixup. if a player cant deal with her 5d/2c combination then keep doing. learn big combos for these 3 moves!
also r action often because why not, its not like people can block/tech grabs.
as a casual liz against casual players her weaknesses wont be as apparent and she might even seem strong. other than have fun you should give this subforum a thorough reading.