Main trunk has beautiful fissured bark. Branches are a contradicting mess, The trunk is valuable. If you can not take the time to put a piece of white cardboard behind the tree and take a picture that is visually free of clutter, well, we can not help you. Chop away and good luck.
In more helpful vein, you are in Long Island, there are bonsai professionals you could either bring the tree to for advice or service or have them come to you. (for a fee of course, usually well worth it). There are local bonsai clubs, Long Island BNutters, - please help this member out.
As in medicine - first, do no harm. You do not have to do any pruning or cutting this year or even next year, just keep it watered and in sun. Use the time to learn about bonsai, learn about local bonsai artists, local clubs, local resources. There is no rush to do anything. That beautiful bark took decades to develop, no reason to rush into anything that might ruin the tree.
One of the biggest error newbies make is chopping off way too much, and then they have to wait years, decades even, for the tree to grow back and fill out much of the foliage they removed. Also, though less common, pruning too much from a pine can quite possibly kill it. Much better to go slow.