I wouldn't take Ostarine and LGD together. They both do the same thing and are fighting for the same receptors.
Ostarine is a cleaner gain. If you stayed at 15mg per day you'd probably gain around 3-7lbs in 8 weeks.
LGD will be slightly more bulk at around 7-10lbs over the same time period at around 5mg per day.
You also have to factor in water retention and hunger from the mk-677.