The clover should start showing up after you graze it the first time. I have had trouble with medium red clover staying for than couple of years. The alsike persists for years in my area. Just remember to let it go to seed occaisionaly to replenish the seed bank for desireable species. Alsike in not recommended for horses as it could cause lamenitis(sp). I frost seeded orchard grass/ryegrass/festolium mix on 5 acres that I abused bad last fall. It was a win/win situation all around I might get a good response from it but the wife is happy that the left over seed is out of her basement.
Keep us post on how you make out.