Have a read through the fin primer I wrote for the forum, a good basic knowledge is there.
But my clear advise is to beg , borrow and gather ( without the stela) a range of fins to suit what you plan to do with your surfing.
Make sure your longboard has a centre fin box, the first experiment in getting your tuning on the board, move each centre to various positions in the box, see how they work for you. Simply put forward = looser to turn back = tighter, try wider bases and different rakes , depth a rule of thumb is 1” of fin per foot of board, break the rile and see what that give to you.
If your longboard is a 2+1 set up vary between single and multi finned.
Look to different arcs from your turns in the water and learn to set the rails before moving forward and back with a good cross step as opposed to shuffle or jump.
Be aware that fins are described with just as much hype as any other saleable item in surfing.
What works best for you is the best fin and the thing you can effect most is your own level of skill.
Enjoy thoroughly
