We started out the same as you...only two and dry lotted to start with. Couldn't find loose sheep minerals anywhere around here without ordering online and paying freight...so...kept looking...went to a local Coop store that had pelleted Sheep and Lamb pellet food with high protein and all the minerals and vitamins in it...also the correct amount of seleium for our area...for salt they get a plain white block. They had free access to second cut good hay, and fresh water.
Your sheep will let you know what else they need...they are so good at showing you what you hadn't thought of

Built a better feeder...built a better hay feeder so they wouldn't waste so much...extended our sheep/birthing shelters...added one small pasture...then a second pasture, now a third large pasture.
You'll want to stock your just in case medications...antibiotics and needles, vitamin supplements, worming supplies, hoof trimming tools, Blue Kote for any scratches or wounds...the learning curve gets fast once you've got them!
Enjoy them...sheep are such loveable animals...and one day when you top a dozen sheep, you'll think back to when you started and realize how much your first sheep taught you.
I really can't imagine my life without sheep and lambing time...DH and I had never had sheep before, but didn't take long to be smitten big time!!!!
I hadn't heard of this forum when we first started out...glad you did!!!! So many good people on here with so much experience!!!!