I too always put quality before quantity esspecially for new starters, their always told that 1 good punch is better than 100 crap ones, you only get better by hitting harder, 10 good press-ups will better develop you than 50 crap ones.
i'm also getting older (like bri) & have to work around my injurys.
running:
20mins at a fast pace is enough & 1 good run on weekend
If your going to be training for 6-7 days a week you need to seriouslly think of making up a training planner set up over 1 month alternating between easy/heavy training & running/stretching, try to break up the heavy training so it's not all together.