Raid matchmaking would have been based on light level and completions. Anything else would be unfair. I am not sure you would like to venture into totems or warpriest with 5 others level 280-290 and with non experience. You are better off asking in LFG for someone to show you the ropes.
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My raid group did up to warpriest on the first weekend underleveled with no experience. Took us 2-3 hours, would not do again.