Usually, you get three spine ranges in a test kit. I'd recommend you start at 50-55 and go up from there. Do you know what kind of string is on the bow? If it's dacron, the 50-55 should work. If it's low stretch, 55-60 or even 60-65 might be better. 55-60 will also likely work with dacron.
I don't recommend bare shafting woodies, particularly with an ASL, which is cut proud of center. You will need to pick up a hand held taper tool, or, if you have a table saw or disk sander, you can make taper boards and grind your tapers that way. You already have fletching experience and equipment so go ahead and fletch up a couple.
Once you figure out your draw length, I suggest you cut your arrows (or one or two test arrows to start) one inch longer than the back of the bow at full draw, plus an inch for the taper for the point, and then tune with point weight. Generally, your choices are 125, 145, 160 grains and heavier in field points. Not everybody tunes this way, but it works pretty well.Good luck.