Ok, from the wording of that question, I'm going to guess you're entirely new Ragnarok Online.
Firstly:
http://ratemyserver.net/
Best RO database out there. Now they won't have the gears custom to this server, but those can be found on the forums. (
here)
Additionally, even if this is a private server, you can still find VERY useful information on iRO's official site.
http://iro.ragnarokonline.com/game/ragenjoy.asp
Things to take not of there are the card system, elemental system and especially the upgrading system. (You'll want to upgrade your weapon as soon as possible)
->Side note: think of cards as materia from Final Fantasy 7, except you can't remove a card once it's placed in a piece of equipment.
Lastly, for gear... a wonderful thing this server has is when you create your first character, there's an NPC that will give you all the basic gear you will need to get started. Weapon, Guard/Shield, Garment, Body Armor, Foot Gear, and Upper head gear.
You'll have to look for lower and mid head gear on your own (Mr. Smile masks are easy to make though), as well as find yourself some accessories too.
I think all that will get you off to a very good start.