Keep an eye on the classifieds to see what stuff goes for and then do a little research on what looks to be in your price bracket (
http://www.pbreview.com/ is a good place to start). There's a lot of threads like this around so do a search but for speedball i wouldn't recommend starting out with anything lower spec than an ion...you can pick up some nice second-hand angels on here for not a lot but i wouldn't bother going for anything higher than an etek as that's an awesome gun...for an air bottle you are generally looking at a 1.1L 4500psi fibre wrap bottle and depending on the gun you get will either need high or low pressure air (although some guns will run fine on either)
mask you want something decent and new, or at the very least a new lense...these are the most important part of your kit so don't skimp here...I use JT proflex's and find them very comfortable but there are plenty of good masks around (i3's, events, grills, etc). Also make sure it's a thermal lense as they will stop you steaming up as much...
hopper-wise you'll want something that can do 15bps as then you wont have to worry about upgrading when you begin to outshoot it...i think the VL evlution is generally considered a good starting point...
battle pack it's god to have something comfortable, i use an nxe pack with i think is excellent but see what you can find on the forums...
pods are just you're generic whatever you want...you can get dye locklids which are more expensive and can't accidentally open and spill you're paint but i've never had that problem in my pack anyway...
finally playing kit is just what you can pick up and what you like...look for good padding on the knees and elbows and get some pads as well. especially if you're planning on playing anything but back....
