Yo jeez first chill girl. Have you tried watching YouTube? Anyways it's simple look at your hobbies and what you put in (diet) If you want some gains I suggest you drinking in the morning (muz/beso/milk/ocholoni ) drink that every day morning and night. Second always eat even if you your full have some snack after breakfast,lunch and dinner , also don't burn calories as much as possible decreases your movement don't do sports. Third - Get your self protein powder Or mass gainer that gym guys use and do little exercise twice week for at least 15 min The exercise are weight lifting (not to much though since your girl ) And squats and that's it within the 6 month period you Will be able to see big gains (change)