What equipment do you have at home? At your size and weight - 5-7 pounds is realistic over the winter however I think it is wrong to only focus on your legs. Legs can be your major motivation but come up with a balanced routine and I think you will perform better next spring. Focus on the compound movements and throw out the isolation movements. Focus on increasing protein intake and lastly don't forget about your core. Core exercises (IMHO) will help your power a great deal.