If your looking for a good set of googles new, try here,
http://www.lpspaintball.biz/acatalog/Goggles.html
Can range from £50-£85. See if you can try some on first, feel how comfortable to suit you.
Secondhand, expect to pay anything from £25-£50, but i do recommend you check the lens. I normally buy a new lens every few months, but that depends on how much you play. New lens cost anything from £20-£30.
Then set yourself a budget for a marker, hopper and bottle.
If you can afford it, then go for something a bit better than what people suggest as a starter marker. You can save yourself money buying right first time, and less hassle of having to sell the cheaper marker on and buying better second time round.