Just because you are putting your information into a Powerpoint presentation instead of a formal written paper doesn't mean you don't have to cite your sources. All information unless it belongs to you, must be cited.
Support for citing materials in MLA format can be found online from the Owl at Purdue.
Color Basics
Color Combinations
Background color
Source: SIU School Of Medicine Library
Free short and simple tutorials available HERE Examples of training include: formatting assistance, adding images/video/hyperlinks, working with tables and charts, etc.,
ITS provides training programs for you through Atomic Learning. Access Atomic learning here: https://www.atomiclearning.com/highed/
Check out this list of presentation software and presentation creation assistance.