I played tournament speedball for the past 7 years. and well I loved the sport .. but it can get really pricey.
as for tips..
*****-Always keep your mask on! No matter what! there are too many "what ifs" that can happen..trust me
-Dont be afraid to get shot.. it will only sting for a minute..
-Communicate with your team mates.. tell them where the other opponents are!(communication is key)
-when looking for opponents (snap shoot) aka keep as much of your body behind the bunker as possible,and only pop your head out to see or shoot..leaving a much smaller target for the opponents to shoot at!
-if an opponent is running try and aim in front of them and make them run into your shots
-Dont be afraid to run and dive.. move to new bunkers..or try new things and see what works for you!
-Always be a good sport..Its just a game.. if you get shot, call yourself out and work on how to avoid it the next time!
-Have Fun !
Clothing:
-Wear something comfortable not too bulky.. you want to be able to move..
-when I play I wear a jersey and a shirt underneath..but I suggest you wear a long sleeve and sweater untill your used to it.. as for pants thick jeans or even a pair of coveralls work great.
-Shoes.. its important to wear good ankle support.. you will be running around and the ground can be really slippery! or if possible I highly recommend cleats (if your allowed or have any) which will give you great traction indoor or out.
as for the paint.. it should wash out. but it may take time.. I tend to hose my gear off then scrub then toss it in the washer.. and it should be good to go
and well the most important thing would be to go have fun with your friends. and remember to always think safety first.. no matter what sport or activity you may be doing!
-Have fun and hope its a happy birthday!