MN Splash is going to be a smashing event. Stop at my class if you want to learn about drivetrains.
As far as mentors are concerned, we are limited ourselves for mentors who can show up frequently. However, our team as a whole (if I can accurately speak for all of them) would be willing to help as much as we can, over email or in person.
For internet resources, the search tool on Chief Delphi is great. There are sooooo many nuggets of gold, from the classic JVN design calculator to the recently posted introduction to electricity document. Simbotics' website has a great range of resources that I browsed through when learning FRC as a new team member. Our website, kingtec2169.com, has a growing amount of resources that we plan to expand on soon as well.
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2014: FRC 2169 scouting/spirit, FTC 7897 Mechanical
2015: FRC 2169 Mechanical/CAD
2016: FRC 2169 Mechanical/CAD
2017: FRC 2169 Head of Mechanical