Ammmn... ok!
But I have to say, that I only managed to dock ISS two times!
There was a whole bunch of luck involved!

So here are the basics:
As the manual says: Alt < 30 km Climbrate 30 / 35 m/s
Alt < 60 km Climbrate 20 m/s
Now here's the trick: When reaching 60 km your trim should be set to max. Reduce your climbrate to 0 m/s.
When trim is zero again, your drag reduces and you will be able to gain speed for orbit stabilisation.
You should have about 30% fuel left. Now it's time to pray that your RInc is < 10° (some peopel do that by calculation
but i think that's boring

).
Try to reach ISS

I reached ISS with about <1% fuel the first and <2% fuel the secind time! 8)
But there are really mad guys over at m6 forum who managed to dock with >30% fuel left.
You'd better ask them how to do the job.

C Ya