Ron has given you some good links to get you started. Check the parts lists/diagrams in the manual against what you have. Use the 10E manual not the 10ER manual from the link if you do not have a manual with it. There were a lot of changes made to the Model 10's during their production so it is important to get the correct parts if any are needed. Patience in getting rusted parts separated is important, DO NOT try to force them apart which may break them. Remember your tool is about 70 years old now. Posting pictures will help a lot in describing your questions plus we like to see how things are going. I have restored 6 Model 10E's and another 13 10ER's. What may look like a hopeless pile of metal can be brought back to life. There are parts found at times that cannot be saved and must be replaced so care must be taken during restoration not to cause avoidable damage.
For those eagle eyes out there
Yes, that is a homemade lathe tool arm and rest. It did come with its original arm and rest also which is shown in the restored photo.
Mark V 520 S/N 09-11-01 completely upgraded to Mark 7, with all SPT's & more.
Model 10ER S/N R64000 first one I restored on bench w/ Shopsmith metal ends & retractable casters. Has Speed Changer, Model 4E Jointer, Jig Saw with lamp, a complete set of original accessories & much more.
Model 10E S/N 1077 oldest one I have restored. On bench w/ Shopsmith metal ends & retractable casters.