Return of Reckoning

After just learning about this private server nostalgia and my fondness for warhammer got the better of me and I am now downloading the client

Being completely new to this community here, I am just looking at some pointers where I should swear my allegience, to the forces of order or maybe destruction and then which classes will be most welcome.

I am mostly asking because I want to find where I will be most wanted and welcome by the community
I guess I am asking for some "meta" overview in relation to what the factions need and not the "sigh yet another one of those -class-".

My thoughts on class archetype choices atm is mostly boiled down to this:

Healers: Warrior priest, nothing else really appeals to me as much among the healers

Mdps: Looking at slayer/choppa or marauder here mostly, although witch hunters got a badass vibe about them

Rdps: Not too keen on the casters, I guess SW is my best bet here if those are in high demand in groups.

Tanks: Not really anything I dislike here, open to suggestions

I hope that made some sort of sense, so heres to hoping some of you can help me choose between all these awesome classes from two equally cool factions

Probably a Knight of the Blazing Sun. Order seems to lack tacks in general and Kotbs is someone who provides a lot of indirect power and utilty