My first priority after hitting 80 was 5x Jewelcrafters (375 skill to unlock the JC daily) to generate money from dragon eye sales, think of it as an investment that will pay for itself rather quickly. Check your servers dragon's eye prices first but 150-200g each seems fairly common (not too long ago you could get away with selling them for 300g each!).. then your making 750-1000g a day selling 5x dragoneyes for only ~5-10 minutes of your time. If you don't mind spending time doing daily quests and/or money is not an issue to you this probably isn't a big deal, but for me it was huge

After that, If are able to clear normal mode ToC just farm the crap out of that place until your entire team is swimming in purples. If you are having trouble with ToC in current gear hit up the AH and buy cheap BOE blues for everyone which provide the best upgrades, mabey some of the BOE/crafted epics for your tank/healer. Also IMO the crafted titansteel weapons + enchant are also a good investment imo as you won't replace them until you are able to clear Heroic ToC

I'm not sure if your interested in PVP or not but if so definitly do the wintergrasp quests twice a week (once on tuesday, once on saturday when they reset...oddly enough). Or more often for the tokens... The entry level pvp gear these days from WG and honor isn't itemized the greatest for PVE, but its much better then quest blues/greens


Have fun!