If you have an Orvis nearby they do a fly tying 101 class that I took my wife to pre-COVID that's fantastic, they teach you everything you need to know from palmering to whip-finishing. You can't do the class in person now, but I know that they're offering it online via zoom, and it's still free I believe. There are also a bunch of fly shops around the country that are offering free fly tying zoom sessions, Schultz Outfitters in Ypsi, MI is one of them. Great way to get started with the fundamentals.
When it comes to gear, the sky's the limit, but I recommend buying just a few things to get started and see if you really like it before dropping $500 on a rotary vise or $30 on a pair of scissors. There are tool sets you can buy that will be a great help and a one stop shop, but realistically all you need are the following: a pair of scissors (that you ONLY use for tying), a hackle plier, a whip finisher, and a bobbin. Those four tools should be about $30-40. Get a cheapish vise, shouldn't run you more than $50, and you can get plenty of used vises on sale here for about that. The one I started on was a Griffin Mongoose, but you can get a Griffin Spider for used for $50-60...or the kit with everything you need on amazon for $120.
Amazon.com : Griffin Odyssey Spider Fly Tying Vise Travel Kit : Sports & Outdoors
www.amazon.com
Amazon.com : Dr Slick Fly Tying Tools Gift Set with Fly Box Combo. : Fly Tying Equipment : Sports & Outdoors
www.amazon.com
For patterns, find a youtube video for a recipe you use regularly, buy all the supplies that you need for it and tie it a bunch till you get good at it, then fish it. Expand from there. A good resource for kits on flies is 239 flies, they'll include everything you need for the fly minus the hook and wont charge you extra on the supplies. Most of their kits are good for 20-30 flies.
In regards to glue, you could be fancy and get UV resin and a UV light...or you could use $1 super glue from Lowes haha
All out the door you're looking at $150ish once you buy your tools, a vice, and your materials. Hope this helps, and if you need a one on one to teach you how to tie something PM me. I'll set up a Zoom call and I can teach you a class.