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Cutting New Windows Into Concrete Block Building & Filling Old Window Openings

Name: Bob T.  City:

Question: I have bought a property that has an old (1950's) Concrete building that is about 38' X 50'. It has some old single pane windows in steel frame basement type windows in the top course of the wall for natural light. I wish to remove those windows, and fill in that void correctly and then cut in some 3 ' X 4" thermopane windows. Can any one tell me the correct method for replacing concrete block to fill in previous openings and also the correct way to cut an opening to install windows? Should I use replacement windows in block openings or new construction windows? Thank you. BOBT