prepping exterior foundation wall for paint

[Matthew Scott]

My unfinished basements concrete walls are very porous and water has been creeping in. I am painting the outside of my home in a few months anyway so I figured I may as well paint the bottom part of the building's concrete foundation with a water sealant masonry paint. 

How do I best prep the walls for this paint? Im assuming that I should

-fill cracks with high strength cement and flatten out to match rest of all as best as possible. 

-Use some sort of sealant where the foundation wall meets the concrete patio

-power wash cement

-possibly apply a chemical cleaner

-paint once dry

Any advice this would be much appreciated.

 I included pictures of some of the problem areas below.