You've got plenty of time to play with. Have you just finished the season? I want to know how tired/beat up you are?
I think Shaf might be more suited to take the lead on this as you looking at prop as your position.
So you need to focus on strength, short distance speed (10 metre sprints) and some conditioning for general scrummaging/mauling. At 6'2" you could possibly jump at the lineout I guess or are you up against really tall guys a lot?