1. What gun should I buy?
Simply put. If you cannot see, you are no help to your team and you are endangering yourself. I would take being able to see and a pump 'gun over the best 'gun and fogged lenses (any day!!). So, when you buy your goggles, don't skimp. Get the thermal ones with a good field of view (if you already own goggles, go back and buy the thermal lenses for them). If you can, get a fan. You will never regret the purchase.
One last piece of goggle advise. Don't ever wipe paint off your goggles!! Paint is sticky. More times than not as you walk off the field, stuff will get in the paint. If you wipe it off, you could scratch the lens with the stuff that got stuck in the paint. Remember, you have thermal lenses, you paid good money so you could see, don't blow it now. TIP Get a spray bottle, fill it with water (just water) and throw it in your paintball gear bag. When you need to clean your goggles, spray all the yuck off and then dry them. You will have clean lenses and they will last a lot longer.
Ok, now back to "what gun should I buy?". I would highly suggest purchasing a semi-auto. They are just a lot easier to play with to start. You pull the trigger and a ball comes out the end. Very nice.
DO NOT purchase a tournament level gun right out of the blocks. Most newbies that do end up spending more time working on it than playing (because they don't know how to care for it and they break it or get it so gooped up that it doesn't work right). Get a decent semi and learn how to clean it. Practice cleaning it. Be able to clean it in your sleep! Then and only then, are you ready to head to the field to shoot it.
Practice, practice, practice. Practice shooting, practice loading and practice cleaning. When you get on the field, you don't want to have to think about these things. Besides, it is fun to practice loading and cleaning your first gun! You get into the paintball mindset and let other worries go.
2. What should I wear?
This is really a two part question. The most important thing you will wear is your shoes. Bring something that has traction, ankle support, can get really dirty and won't hurt your feet! Don't get a new pair of boots on the way to the field unless you bring an ample supply of Band-Aids! If you do get new footwear, wear it at home for several days before you bring it to the field. Also, invest in a pair of socks designed (yes, socks are technological wonders, just like paintball gear!) for sports use.
I have seen people wear lots of different things while playing. The happy people tend to wear light hiking boots or football cleats. There are some very nice shoes made for paintball (I don't own any, but if you know the folks that make them, I'm a size 10 1/2 or 11). Check with your local store for more info about paintball specific footwear. Alternatives are high top sneakers, but remember, they will get dirty (often very dirty).
Wear gloves if you have them. If you don't, buy a cheap pair of brown cotton gardening gloves. You can cut the gloves to allow you to "handle" things better. I would suggest that you cut the top half off of the glove finger that you use to pull the trigger.
