I'm sure if you start off with some light leg exercises, you'll increase your strength in no time!
I'd imagine that Leg Press, Leg Extensions, and Leg Curls will be very beneficial. Light weight, high reps! Week after week, you'll probably notice drastic improvements in your strength and endurance!
Make sure to use proper form, and if you notice any pain (the bad kind), stop immediately. Also, it's good to allow full recovery time between workouts, so I'd say not to workout the same muscles (quads, hams, etc) any more frequently than once every 5-7 days.