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Well, even when i im not good teaching and making tutorials, i think i can help you with this simple tips:

The Fat rolls are very important. i haven meet some one who dosent have it, especially ehwn they are plus size. That makes you girl more credible.

you only need to remember where and how the fat rolls are. Up you can see the most important of these fat rolls.

using this shapes and adding the fat rolls, you can make an interesing character desings and shapes.

And tip number Three:

NEVER STOP TO PRACTICE!.

See references if you want and expreriment. only with the practice you become better drawing this kind of bodys.

i hope have been helpful.!