which expansion and which class

hey guys i have some question im looking fore a good realm exept pvp and pve

and i dont know which expansion i should play

and i just wanna ask what the ranking for healing classes is in pve and pvp
heard that pally is unplayable :(((

regards

Hpally is pretty much viable in any expansion someone is trolling you.
I'd suggest you start on Wotlk as ur first? expansion as it has most of the content working.
The class is really up to you, you can't just accept what someone tells you it's OP and you go play it, but fail miserably...
You can watch youtube videos and see how each one of them work and pick one you like the most =)

i played all the time Hpallys but if i read some posts in this forum they say it sucks

Well that's their opinion, you can check retail pvp or pve videos for each expansion and you'll see that they're not any bad.
Yeah we have some bugs here,but that's normal for a private server and they are working actively on fixing them asap.