At what level is it good to do a 1st Shroud run?

I have a lvl 15 Sorc (Ebonyfire) on Ghandalla and most the time I see Shroud runs posting for 17-20, 18-20 or 20-20.

Is it better for me to just kill and do quests in Meridia until I can get to level 17, or is it possible safe for me to try my first Shroud run at level 15? (Already have my shard and have been looking at what materials I need for my greensteel item).

Would love to get some feedback about what to do in Shroud as a caster since I would rather not be a complete N00b just slightly one on my first run.

Thanks for future advise/constructive critism/help.

Ebony