Joe,
Enough people have already weighed in about the difficulty of learning/starting with pines for bonsai, and especially those not grown specifically for bonsai. Do work with other trees, but since you asked about working on this one specifically, you did get some good advice on what can be done if you decide to practice. For now, a couple other very general rules of thumb that weren’t mentioned include…brace yourself:
1. Once you identify the trunk line with the best taper; mark the pot to identify the front.
2. Most convincing bonsai have the primary branch emerging from the right or left side; the next branch should be higher, and emerging from approximately the opposite side, and the third branch is even higher, and emerging from approximately the back. This is repeated until you get to the apex. Again…this is very general.
3. Pines tend to produce whorls of branches at the same point around the trunks and branches; like spokes of a wagon wheel. This results in taper and visual balance problems.
4. To keep the tree tapering properly, reduce each of these whorls of branches to the best single branch emerging from the trunk:
a. The best single branch is a branch with needles closest to the trunk, and emerging on the outside of a curve.
b. When you reduce each whorl to the best single branch, you’ll see why this isn’t the best starter material.
5. This step would be best to do with someone with experience:
a. Keep foliage close to the trunk, take what’s left and reduce each branch back to the closest couple tuft of foliage to the trunk. This is the OPPOSITE from the “Poodle” look; you want to remove the outer growth, leaving interior growth that is close to the trunk.
b. Take the end of a branch in your left hand, trace it all the way back to the trunk. Find the tuft of growth on that branch that is CLOSEST to the trunk, then the second closest tuft…then remove everything beyond that second tuft.
c. Be sure each tuft of foliage has a bud on the end.
d. You can see some of this on an unfinished article called "Fall work for pines" at my website
here.
Also, keep in mind that the present trunk might not be the best trunk line. You mentioned liking the trunk line, but remember that you could more easily identify a branch that can be shaped to achieve point 2 above (see attached photo as one option).
After this, post some photos and let’s see what’s left.