ok for one, when the bike has been sitting, the bike acts lick it is in gear probally b/c the pplates are sticking.
2.yes, it will go away after it is warm, the oil doesn't make the plates stick to gether when its warmed up.
3, doesn't matter where the clutch engages, as long as it isn't slipping when the lever is all the way out.
4, to look for notches pull the clutch plates out and look at the "fingers" on the basket, they will either be smooth or will have grooves in them, if there are grooves then this another reason the plates would stick, just file out the grooves and you'll be good to go.