Always my 7 iron before a round but never very many. If practising after lesson work it's usually 5, 7 and 9 irons then throw in some hybrids if the swings OK with the irons.
When I am at the range I always start with a few easy wedges to get warmed up, always stretch first though.
A the course I hit some eight irons in t the nets, don't know why, just started this and have kept it going.