here's a little background. i started playing tennis around the age of 12 or 13 with my pops. i liked the sport, but never took it all that seriously, and ended up quitting after high school at around a 4.0 level. fast forward about 10 years. i quit my day job and had a lot of free time on my hands, so i started up tennis again. for the last year and a half i have improved my game immensely and can hold my own against 5.5's. stamina is still an issue, but i can usually sustain a high level of performance for about 2 hours. my serve was the last thing to come, but now that it has, my confidence is through the roof. it has been 12 years since i've last played competitively, and i'd like to start it up again. friends say i should play 5.5, but i'm not so sure. i have never played against 5.0+ players in a competitive setting and am a bit nervous. i also hear that cheating is pretty bad and that may also set me off. should i start playing at lower levels such as 4.5 and move up? or just jump into things at 5.5? also, any suggestions on what to bring and how to warm-up for tournaments would be appreciated. are there practice courts where i can warm-up like the pros?