From the pictures, your steering is the same through hull push/pull arm that I have. You don't bleed that system, it's most likely rack and pinion and then cable. If your steering is stiff, we need to determine if it's the swivel of the drive, the rack and pinion or the cable. I would first disconnect the arm from the drive and see if the drive swivels easily ... if not, grease the swivel bearing (points on the front of the lower unit behind the red plastic cap).
If the drive swings freely, then time to check the rack and cable - sometimes those are all one unit, and you have to replace all of it.
One of the best things you can do for yourself is order a shop manual. There's a link in my signature to some good information, but you'll want a manual.