Welcome to Autodesk Forums!

Hi Vanessa,

>>>>>my drawing is still black and white, and it is very annoying,

Please verify current Page Setup settings - use menu File->Page Setup Manager to edit current Page setup:

If "Display Plot Styles" option is enabled - uncheck it:

 >>>>some ( only some) of the line-weight is not printing to the correct size.

If you are sure about lineweight settings for Layers and lineweight settings in Plot Style table file, check if the objects with different lineweights have lineweight assigned individually: select object and look at the Properties Palette (Lineweight property), it should be "ByLayer" in order to print correctly, according Layer/Plot style table settings.