Get a Lyman, the newest edition for the powders that have come out recently.
You might have find the older editions for older components.
The powder manufacturers used to (and likely still do) have little softcover free manuals that you can find at gun shops and Scheels. Same with wad manufactures, they usually have recipes for their products (like BPI).
Unlike metallic reloading, all the components in shotshell reloading can make big changes. Primers, powder, hulls and wads...make sure your combination matches the receipe in the manual.
I often find wads, shot & hulls at gun shows cheap. If buying old stock wads, squeeze them, if they have been living for years in sunlight, they might be brittle. I store wads in either a black trash bag or in a closed cabinet, out the sunlight.
Those sub-gauges might be hard to find hulls and wads at gun shows. Used presses are also, as you could imagine, a bit harder to find for sub-gauges.