For gear, check out a local lacrosse shop. They will most likely have the gear you need and you will be able to test it out as well. If the shop does not have the gear you need, you can always shop online. Check out
LaxShopper.com - the Lacrosse Marketplace on where to find the gear you are looking for.
As for gear, you will need:
Helmet with throat guard
Chest pad
Gloves
Stick
Cup
Optional:
thigh pads
What I use:
Mask: Brine Triumph with a triad throat guard
Chest pad: I borrowed a DeBeer Icon but I now have a Warrior MPG 2.0
Stick: STX Eclipse on a Warrior Kryptolyte
Gloves: STX Gladiators with goalie thumbs
I would recommend:
Mask: Just use whatever field bucket you have and attach a throat guard on it. Cascade would be a good choice
Chest pad: If you can get your hands on a STX Gladiator. Otherwise try the Brine Eraser. It seems like a good CP
Stick: STX Eclipse on a DB803. It is a trusted combination. You can always try the Warrior Nemesis as well.
Gloves: Brine Defts were a popular choice. Warrior Superfreaks seem good as well.
If you have any questions on anything, let me know. Have fun!