Carbs are protein sparing. Best to eat solid food in most cases. Carbs, carbs, and more carbs.
Protein requirements vary, but, there's some thought that up to 2.2 grams per pound of lean muscle mass isn't a bad idea.
Bottom line is calories.
Without, consistent, progressive, overload, you'll not make gains, and just an anterior, chest, workout is NOT a good idea for a long list of reasons.
Many gymnasts go on to become great bodybuilders, once they start eating and do non-body weight resistance exercises.
You need to EAT, more than anything, and those calories can come from about anywhere.
For someone as diminutive as yourself, I recommend the see food diet, where, with the exception of high sugar stuff, if you see food, you eat it, and eat until it hurts. If you're active, and you workout, you can do that.
Being obese comes from being inactive, eating the wrong food, and having a poor understanding of how to manage your insulin. You'll want to study up on that. A great place to start is bodybuilding.com.
When I'm very active, I'll eat upwards of 6000 calories a day, but, when I'm not so active, I may only eat 3000 to 3500.
Calories are the single most important thing for you to attain your goals.
In the case of flex89, who has worked with me for 3.5 years, we put 85 pounds of lean muscle mass on Logan in about 5 months. Logan is a type 1 diabetic, so...we made lemonade.
It's important to understand it's mostly applied science.