Your plan ultimately relies on your goal and your resources. You want to gain 35 lbs and maintain low body fat. At your height, you've got lots of room for growth.

Exercise is a key component, but if you're a "low appetite" person, much of your effort will be in eating. Do you get enough protein?

Do you have other goals? Like some improved sport performance, cardio goals, flexibility?

Do you expect to have other resources? Gym, weights?