In this order:

Get yourself a nice strop if you don't already have one, pick a very dull and smooth razor, watch some vids and learn to strop.

Pick out a couple that are sharp enough to treetop decently already, strop them and teach yourself to shave. Treetopping is when you can pass the razor 1/4" or so ABOVE the skin of your forearm and lop off the tips of at least one or two hairs each pass. You need to know that your razor is at least sharp enough to shave your face before you can evaluate your shaving successes or failures. There are lots of youtubes for this, too, and you can get plenty of advice on the straight razor forums.

Learn to touch up the edge of a formerly sharp razor after it has dulled through normal use. This is the first baby step into honing. Master this first.

Learn to hone from scratch, including edge repair and bevel setting. Learning how to do this will teach you a lot about how a razor actually works and what features and characteristics are necessary for it to shave efficiently.

Learn to make scales and wedges and pin them to razors.Also how to refinish and rejuvenate vintage scales.

Learn to sand and polish, thin and round a spine, fix a heel or stabilizer or shoulder issue, center a blade, and make a shorty out of a razor that would otherwise be a goner.

Take those steps in order if you really want to get good at restoration, and yeah, start with the expendable razors. So last but not least, learn how to identify the more expendable ones to learn on.There are already enough well intentioned restorers out there who make heartbreaking mistakes on razors that in some cases are scarce or in very high demand.