As for joining groups, the part Alha forgot to include, DRK is always preferred over DRG. Gearing DRK to a good level is not to bad to do and you need no Emp/Relic to make the job effective, the same is to be said of DRG however. DRG and DRK you should make the Occasionally Attacks Twice weapons from Trials of the Magian, as they are better than your Emp weapon, and take much less time than the relic ever would. As for a short summery of what gear to get for DRK should you choose to work on that, refer to
this post I have in another thread. It gives you a basic TP setup, with a small bit of advice on what to get for a WS set.
Also, since the release of level 99, you can now merit WSs, there are 14, 1 for every weapon, but you can only max 3, currently the WS is almost worthless unless it is maxed (5/5) and requires 100 merits to do so. As such, I advise you 5/5 Stardiver(Polearm) and Resolution(Great Sword) as they are 100% STR mod WSs which are the best WSs for each of those 2 jobs, though in some cases Drakesbane comes close to or beats Stardiver so far as I know. For basic setups for the jobs, I will give you some links, and I hope it helps and is of some use to you. Besides that, welcome back to FFXI, and hope you enjoy your stay!
Links
DRG TP
DRG Drakes
DRK TP
DRK Reso
I sadly have no set for Stardiver because I do not have the extra merits to get it, but mostly I think its just about the same as the Reso set, stack on tons of STR & possibly use the Gorget/Belt, idk if the are good for Stardiver though.