Usually with disputes you only want to address 3 or 4 accts at a time.
It's really up to you. You can always try disputing them off and you might get lucky and have them drop off sooner.
I guess it's all how you want to prioritize them. It will not hurt anything to dispute them so don't worry about that..... but if you know they will be falling off soon and you'd rather dispute other things first, that's totally understandable.
*Another thought.....some people, for their first round of disputes, will do what's called a blanket dispute and just dispute EVERY negative mark on their CRs. I've seen people dispute like 12 things and have 8 of them deleted.
I've never been that lucky. :p
It varies with everyone..... just do what you feel comfortable with
I don't feel like I answered any of your questions..
but hopefully that helped.