I'd like to get some opinions on what level I can start running Strat, BRM dungeons, and Dire Maul so that I can start farming for prebis while leveling. I know that I can already technically start, but I'm trying to get an idea what level I need to hit in order to not be dead weight, and what level I should wait for in order to reasonably expect groups to accept me.

Thoughts?

BRD would be around 52 for the early part, but finishing it should be around 55 - 57 (55 if healer). Dire Maul from 57 also unless North which should really only be 60s. Strat I have done no problem from 58.

I ran BRD more than a dozen times starting at level 52. Once I hit 58 I respec'd Holy and did DM/Strath/Scholo all the way through 60. I didn't have trouble finding any groups along the way. However, be aware that people are more open to a lower level healer compared with tank & DPS, so your experience may vary.