Wonderful! You can see from my avatar that I have one too, just a bit older and with brown lotus decals rather than the red eye... Not all of those attachments are for your machine, and there are duplicates of some. You have both side clamping and back clamping attachments in your photo, but your machine will only take one or the other. You can keep the rest, in case you find another machine one day that could use them.
When you get an instruction book for the machine, it shows all the attachments and how to use them. You can download those online, but I like having a hard copy of an original book in the drawer for each of my machines.
Treadling isn't any harder than tapping your heel while you are sewing. I love to treadle!
Enjoy!