I've started in ZA with fairly similar kit, ditto for 25 mans, so no reason you can't do either as well. Trinkets from MgT if you haven't got them, would be very handy, as it can be very obvious if healers are struggling (not just your kit, but their output), as that can make ZA pretty irritating.
Depending what 25 man bosses you're planning to do, gear investments may be more critical in terms of resistance gear, which is what I'm looking at, with what was planned on my old guild before raiding folded, and what is planned in the new one. Full or partial frost res set for hydross for example looks pretty steep in terms of primals & so on. If you can get assistance with that, then it'd be a major bonus for you.
Former TBC/LK Tank
Waiting for Dunmail Jnr to sleep to enable online gaming.