VIM - format lines to certain width

First,
:set textwidth=80 (or :set tw=80)
Then,

gqq	Format a single line
{Visual}gq	Format visual selection. (ctrl+v to get to visual mode then use hjkl to navigate)

For more help,
:help gq

VIM - Shifting and code formatting

You can shift (indent) code right or left by typing >> or <<, respectively, with your cursor on the line you want to shift.

You can use VIM automatic formating by typing == on the line you want to format.

You can also set the amount of spaces to shift.

You can also shift and format in visual mode (To get into visual mode: SHIFT+V, then j and k to select rows) by selecting the lines you want, then typing >, <, or =.