Welcome to VW!
Stretch works in VW by highlighting the items, and push/pull using the 2D selection tool. I group several items sometimes- its good for equal spacing between fixed points.
Trim can be done using the trim tool in the basic toll palette. I also draw a line over the item to be trimmed and do a command-T.
Same goes for extend, its in the basic tool palette. The tutorial are good for this basic stuff. Hope this helps.