Neat old set. They are almost certainly made of high carbon steel and will therefore get dull quickly in use. Great for developing sharpening skills!
I can't tell the dimensions, but it looks like the tools you may not be familiar with are 2 continental style spindle gouges, these are shaped from flat bar stock rather than being ground from round bar stock, and they are great for long curves. Can use them for roughing in a pinch but a roughing gouge or skew is better for that.
Nice jig. You'll find it will work well on the standard spindle gouge because you just rotate it, but for the fingernail grind you need to both rotate and pivot, take a look at the One-way wolverine jig or the Ellsworth bowl gouge jig to get some ideas. Looks like your jig will be easily configured for skews too which is nice.
Have fun!
Jim