The main thing with the rower is getting the technique correct, do it a slow SPM first and concentrate on how you do it. A SPM of not more than 24 will be the best.
Once that you have the technique spot on then try to increase the peace (time for 500m) without go over 30SPM.
Select a standard program of 500m with 1 m recovery.
After the section change the display screen and select wats (the force that you put to achieve the peace) That will give you a figure of how efficient is your stroke.
A good way is to have this screen selection on and do the first stage of the rowing (leg extension on and see how much force you are putting in. Then do the same with the second stage (legs extended) and only working with the arms and see how much force you are putting on.
With this figures and your pace (time per 500m) you can monitoring your progress.
Do not put the resistance over 5. The resistance between 3 and 5 equals to the resistance of a boat in the water.
Regarding the technique this IMO is the best tutorial.
https://www.youtube.com/watch?v=Dt8aOHmCNZQ
https://www.youtube.com/watch?v=i5a6d9dimgY

