Gaining weight by muscle after eating disorder

I’m 15 5”9 and I weigh about 114 Pounds and I recently came over my eating disorder of being anorexic.Today was my official day I started eating more and I ate my daily calorie intake in one standing as a devotion to my weight gain journey.I want to weigh about 120-125 pounds.As my devotion,I ate 2600-3000calories worth of healthy foods including nuts yogurt spinach fruits brown rice peanut butter oatmeal whole grain bread and a salad.I’m vegetarian so I don’t touch meats.Today was my rest day of working out and I’m wondering if it will go into my yesterday’s workout of arms abs and legs?This is new to me because I never wanted to gain weight in my life but I’m a new person with a better mentality.

Also give me tips in the comments of how to do this in a more healthy/efficient way

Gaining weight by muscle after eating disorder