I'd look at it in this order:
Get your rod, line, leader, fly balanced (an instructor would be ideal here)
Get some casting instruction
Figure out what poly leaders, versi leaders, tips... etc will work for your intended presentations AND work with your line.
Casting sinking leaders/tips isn't any harder, and in some ways can even be easier. Don't go there yet, not due to difficulties of casting, but rather you need to get some of the other issues dialed in. Sounds like the line you have is not the easiest for learning, a shorter head (skagit, scandi) would probably shorten the learning curve.
Again, if you can find an instructor to help you it would be money well spent, and might help prevent bad habits, and redundant extra equipment (lines, tips, spools, etc).