Hmmm I would first like to say...........Please go and do a course on sheep somewhere! It never fails to amaze me how people buy sheep/ lambs with not an idea how to look after them
Now then, did you get any info from their previous owner? At 2 months they are a bit young to have left their mums
Have they been wormed? vaccinated against blue tongue if in an area where the vaccine is available? Have they been sprayed with anything to protect them from flystrike or kill lice/ticks?
They will have been eating grass if with their mothers in a field before you bought them but at the tender age they are I would reccommend feeding soft meadow hay from a rack, not off the floor, and feeding a cup of lamb weener/creep pellets per day as they will be missing on the nutrition they should be getting still from milk. This will also introduce them to hard feed and make them easier to catch later on.
Worm them before you let them out, if not done just before you purchased them, check their feet and trim if necessary.
Good luck