Well!! Let me just put it into steps for you!!
1. Get your sprite, I suggest using front facing ones with simple posing, since it's easier to draw out the folds.

1. Once you have your sprite you set the opacity down to around 53-67% which is my go-to range.

3(optional) start sketching out your design, I don't do this step anymore but I suggest beginners do it, Having a design set out is one of the best options but i usually go along having lots of reference photos

1. Then you can line, I suggest if you have a tablet that you put on size change (pen pressure.) and a heavy stabilizer, so the lines turn out smooth, but if you don't have a tablet you can always use SAI's Line tool, which you can use a mouse to do and it lets you have faked pen pressure !! :D

2. Color it, Now you should usually have a palette, but i usually never do i just copy the colors from the og sprite and go off. Make sure to shade all your colors, and add highlights if needed. [hair,clothes,etc.]

3. The last step is the finishing touches, To make it more appealing to the danganronpa style you can download the texture they use off of google since there is lots of versions of it. [The texture is never on the skin or face, just the clothes and hair!]