I learned Seamly2D from a series of YouTube videos by Minimalist Machinist. Start with Seamly2D Walkthrough - An introduction to Seamly2D. There are 6 videos in the series and she walks you through drafting a bodice using Helen Joseph Armstrong’s method, all the way thru printing. It might be a little dated at this point due to improvements to the software but we’re all here to answer specific questions as they come up.