Search through the general guides on here
Goggles are most important
Getting to retailers, trade stands at events or checking out other players gear will allow you to see what's around, get some hands on, try on a few goggles
There is no such thing as paintball gear for tournament, woodsball or scenario
They are all paintball
What there is though is ergonomics - in a tournament/speedball style game instant and instinctive moves may be vital - something ergonomicaly right, with a small footprint to make you faster at getting the shot off, a smaller target etc will help
Rof is less of an issue - maximums are capped so the majority of appropriate markers and hoppers will keep up and put out enough paint
Something ideal for speedball is just as good for the woods
The woods and scenario field will be bigger and more diverse than the tournament field. You can forgo some of the speedball needs, but with them you can still take an advantage in the woods
Air - avoid co2 unless it is the system used at sites you attend (and if so this will be a factor in your choice of gun)
By default to for a 3000psi aluminium/steel cylinder. This saves over £100 compared to a fibre cylinder
If money is no object then go for a fibre cylinder - but put more work into deciding on the right one. For fibre you need to consider your needs for size and shape for ergonomics
You need much more gear then goggles, gun, hopper, batteries, and air.
You will need paint to play with (buy it where you play)
You need pots/pods to hold the paint
You need something to carry the pots/pods (a pod belt or a vest rig)
You need good footwear, and depending on your style you need general grip, sprinting grip, comfort for all day wear. Vitally you need ankle support
You need playing clothes (and remember to pack clean clothes to go home)
You do not need specialist clothing, you need something comfortable, preferably in layers so you can wear as much or as little.
Loose soft clothing promotes bounce
Consider you forehead, head and hair. Wear a cap or bandanna, and preferably forehead padding
Consider your neck, but don't overdo a big scarf and affect your airflow which can increase goggle fogging
Add sundries such as barrel swab, rubber goggle squeegee to shift paint, microfibre to clean the lens (just a bit of wet and a bit of dry - no fancy chemicals, basic tools, spares for your gun and knowledge to do basic checks, a handheld chrono can be nice
You need something to carry it all
An important note - if you plan on speedball and intend to join a team don't buy everything - you may suddenly find yourself picked up by a sponsored team and you have already spent all your money on the wrong brands or colour scheme then need to buy discounted but still a lot of £ from the sponsor
Not sure on your preferred style or not aware of all that paintball can offer - check out the 'what paintball costs thread' for a summary