Some additional thoughts:
Consider buying an older second-hand machine. The modern ones with all that electronics can and do fail – I have repaired some. But the older purely mechanical ones (well, the good brands) seem to last forever.
Stitches – I use straight and 3-step zigzag. Single-step zigzag is usable on webbing, but NOT on silnylon.
Needles – good ones. I use Smetz, but there are other brands. You will need a range of sizes.
Thread – great and passionate arguments rage here. Plain 100% cotton is OK for home quilting enthusiasts, but no reputable outdoors gear maker would ever use it. A lot of it is 'not that good' either. Core-spun poly-cotton is very good for most things, while bonded nylon is best for heavy fabrics and webbing. 100% polyester is usable… Do NOT buy serger thread for a conventional machine!
Needle/thread sizes: official recommendations are generally for needles at least a size or two larger than you need. But if you see the thread snagging on the needle at the holes, either your needle is too small or your thread is lousy. Cheap thread does that.
One or two sewing lessons at a local fabric/machine shop (or from an experienced elderly lady…) would be wonderful. There is so much valuable hands-on instruction to be had.
Cheers

