I have a 10 Ga reloader and reload two loads. One is a Turkey 2 oz load with either 7's, 6's or 4's.
I have loaded it with 7.5 and shot a few pot shoots with it at local clubs here in Southern Ca.
I also have a 1 1/4 oz practice load.
I would start with the Lyman Shotshell Reloading Handbook. Mine is the 4th Edition and is from about 12 years ago.
Are you looking to reload Steel, Bizmouth, or Heavy shot?
All are going to load differenty. The weight of a Steel, Bizmouth, and heavy shot BB are all different and while all will have the same pellet count per ounce by volume the Heavy shot charge will be much heavier and needs to be loaded differently.
I would suggest a MEC sizemaster as a reloader. The Mec Jr. also works well ( what I have only because I did not know they made a sizemaster when I ordered it). The Size master has two added features of a primer feeder and a brass resizer built in.
I forget where I got my hulls. But I think I saw in Cabela's 10 ga hulls as well as unlabeled boxes and other items. You need to pick the hull you want to use then the shot payload and the go to the Wad, powder, and primer.
Where I'm allowed to use the big 10 on water fowel I buy heavy shot or bizmouth and make my practice ammo meet the published speed on the water fowel ammo box.
