When can I realistically expect to run the 1st couple of instances in Northrend?

I missed the time to be able to run Kara and heroics as I just dinged 69 with my group.

I see people in threads talking about running some of the 1st 1-3 instances, but those folks are probably decently geared. I should hit 70 this weekend and will take the plunge over, but am afraid I will only still have my Outland greens and blues.

Can people please comment...thank you.