Weight Gain Help!?

{Before anyone makes any rude comments I have talked to my doctor about gaining weight, all he did was put me on the pill that was supposed to make me more hungry to help gain.} I have always been unhappy with my body because I have always wanted a bigger lower section (butt, thighs, hips). I have always been an XS, S, Size 0 gal.

I weigh 104.0 lbs and this is the heaviest I have been. I just want to know your opinions on what I can do to gain weight. When I sit down I have the body type I want but when I stand up it all disappears. I’ve increased my calorie intake to 2,611 and want to start working out (new year, new body type of thing) but I do not know what specific workouts to start doing. { I rarely go to the gym with my busy schedule so anything I can do around the house or without weights would help. Will insert pictures of me sitting and standing. }