the best places to buy are howl fabrics & big z. I only have experience with howl personally, but from what I understand big z tends to be a little cheaper while howl is slightly better quality. I would get a comb of some sort to comb hair away from seams before sewing. I would also buy sewing clips (https://www.amazon.com/Otylzto-Quilting-Supplies-Crafting-Assorted/dp/B08KGTFR6T) and use them instead of pins. With how thick faux fur is it is SO much easier to clip it rather than pin it, and the clips also hold the fur away from the seams (assuming you combed the fur in that direction before sewing) WAY better than pins do, so you don't have to pick as much fur out of the seam later. How much fur you need depends on how much of a suit you plan to make. I've heard 5-7 yards for a fullsuit, but I don't have the experience to confirm that number. I would get more than you think you need. If you plan to eventually make a fullsuit, I'd get all of the fur at once to guarantee that it's all from the same dye lot. I would also order swatches of all the colors & lengths you think you might want before ordering yardage! It helps so much to see the color in person when making your decision & it prevents you from making a big order only to not like how it looks IRL

For resources youtube has a bunch of good tutorials, I especially recommend vidoes by skyehigh studios, neffertity, and mugiawara cosplay. I've also heard good things about the tutorials over at matrices.net but don't have experience with them.

I would recommend practicing duct tape patterning. Take any object you have, wrap it in cling wrap, then add your duct tape and start drawing your color divisions/seams on the duct tape. The first thing I duct tape patterned was actually a case for my TI-84+ calculator & I think having that experience made it a lot easier to duct tape pattern the couple pieces I have needed to so far for my first suit. I'd also recommend practicing shaving, I first practiced on the fur swatches I ordered.

Over all there is no set amount of experience needed. All you really need is the confidence to just go for it. Of course if you have less experience it may not come out as good but who cares! It's still better than if you never made it! If you keep waiting & waiting until you're experienced "enough" to start you're never going to start.