To be honest I'm not really sure what to do with it now
I guess that depends on what you want this tree to become - you need an image to work towards... Do you want to keep it tall and do a far view tree? Or perhaps cut it down to the first branch to make some wicked taper and regrow the top from that one branch for a near view? Formal upright, Informal upright, slanting? The possibilities are all there. But now you must decide how to guide this tree to a final image of you're choosing.
What I do is look for the best feature of the tree then work around it. (keep in mind the best feature could be deadwood you haven't done yet) Confused with which idea to run with? Do a google search for other larch bonsai... sometimes seeing a tree similar to yours might get the ol' synapses firing and you'll have an epiphany.
But before anything - make sure the plant is healthy enough for the work you eventually decide on doing. It was just collected last year, you've got some time to think while it's still recuperating from collection and getting used to your yard.