About grp-play.. I'd suggest that you start doing some moria instances to get into tank- and dd-roles within instances. Or play one of the 'in their absence' instances a few times.
Concerning armour: The best armour set available for your lvl is probably the one you get during the isengard epic story(volume 3). After you hit 75 I'd go for the galtrev set. The foundry offers quite a few medaillons each run, you should be able to barter it in no time. I wouldn't recommend you to go for a lvl 65 set anymore, they are pretty useless compared to stuff you'll get on 75 UNLESS you plan to stay on that lvl for some time.
About the skirmish sets.. I was never really fond of them, quest rewards tend to be better.
[b][color=orange]Nuviell - MINI 85[/color][/b] //momentan in Rift unterwegs, Shard: Brutmutter
[b][color=orange]Faenyl - LM 85 || Cay - WRD 85 || Laori - RKP 85 || Soyra - Burg 75[/color][/b]