I spend all my gold on enchants and raid preparations (free epic gems from guild bank ftw!). Especially for progress raids, loads of food, flasks (or stack of elixir of demonslaying if it's brutallus), haste potions, etc. Once you raid you have lots of moneysinks. And enchants cost few hundred gold too.
AND of course best moneysink since last patch - 22 slots bags! If you have too much gold just buy as many as you wish
mamacint - well, pvp sucks
About PvE, well. I guess start with some dungeons and grind rep for heroics. You can do Kara preq too since iirc there were some decent rewards from it (and ofc people asking to open kara cause they dont have key are annoying as hell
). When you have some decent gear start Kara, you can get to some Kara farming guild or find some pugs. 22 badges + some nice epics for beginners = win. Just remember to read strategies before going there, the ones for Kara arent too complicated (check wowwiki or something, i dont remember if bosskillers has tactics for all kara bosses). Then after that, well, are there still guilds doing SSC/TK after 2.4? If yeah, go there or some guild starting MH/BT (first bosses are a joke... well, actually whole MH/BT with exception of 2 or 3 bosses is a joke...). Collect gear and pew pew to Sunwell. This can be harder than it sounds and will take few months, but dont give up. WoW is a game were commitment can give you a lot
And of course, if you are tank, you shouldn't have too big problems finding guild. I am rogue and finding one was hell (after my previous guild disbanded I had to migrate or i would be stuck to PvP lol.)
And of course, remember to always have best enchants you have (Aldor/Scryers rep! Will cost quite a bit, forgot to mention it in moneysinks, but is absolute must if you want to raid) and at the beginning blue gems, then move to epic gems.
I don't think I made to many mistakes in this wall of tl;dr text. If i did, someone correct me or something. Just starting raiding from my rogue's pov <.<