We're developing a set of HD videos (over 15 hours of content) designed to help you to use Greek and Hebrew tools in Logos without formal training. Or you can use them to help knock some of the rust off your Greek or Hebrew!
http://www.logos.com/products/prepub/details/5876
Scholar's is recommend. and BDAG as well. However, if you don't have BDAG you can still get plenty of value and skill with Logos 4 without it.
Post here with any questions. And I'll see what I can do to answer them.