Get close up pictures, it's to hard to ID with what you have there.
Rob had some good points. Leave the lower branches for now (especially any that sprout from the base).
Secondly, decide how big of a pine you want. To make an awesome pine bonsai, yes it certainly takes many years. However, you could have a nice small size bonsai in just a few years if we can utilize sacrifice branches, grafting, and a little imagination.
What you can do right now is wire the main trunk once you've figured how your pine will look and how large it will be.
Oh and next time dig up 20- that way it doesn't hurt so much when you kill 12 of them
<-- killed like 60% of the first JBP I worked on lol