The order in which I spent on (chronologically) was 3M dummy plan and animus stone; storage boxes; two gilding wax to learn the trait from, the Ebony motif, and currently working on the basic crafting stations to help a bit with inventory management.

I bought the storage chests.

Guild masters often buy the attunable stations for guild houses.

Attunable blacksmithing station for DLC I didn't have access to at the time, Motif and now Jewelry crafting research and Blacksmithing research scrolls.

Attunable crafting stations. I am trying to get all the crafting stations for my main guild. At least starting with all the DLC and chapter stations.

I do top tier writs on 6 characters every day (well recently had to drop WW as I just can't get a survey to drop and keep running low on mats). I'm not swimming in vouchers. I have about 1200 and I haven't even bought the new furnishing plans. I only recently got all the storage and the plans from the previous update (waited until they were 100 vouchers on his assistant).

MWs are a fickle thing. You can get tons of 5-7 voucher gear writs and slowly build them up, or you can get lucky and pop several 100+ ones. But, I digress, and no I don't need advice on getting MWs.

Back on topic - you may want to consider saving up for some of the housing storage. Even if you aren't into housing, you can get a free inn room to place your storage in. You can only have one set up in your room at a time (unless you have ESO+) but you can set one out, fill it up, put it away (all items are safely stored in the container and can be accessed by putting out the container again), then put out the next one, fill it up, and so on.

There are a few consumables right now, but if you have all research done (or don't care about getting research done ASAP), you can skip the research scrolls. That leaves diminished aetherial dust (if you want to craft some 100% XP potions), gilding wax (if you want to craft speed jewelry for your own use or to sell to others for research), pumice stone (if you want to craft ebony gear - but you can just create an outfit in ebony without needing the style mat), animus stone (to craft target dummies), and that's about it, unless I'm missing something. Certainly, there could be more, but not all of us are swimming in vouchers and thus need a voucher sink.

Attunable crafting stations

I bought: 3m dummy recipe + stone, basic crafting stations, dye station, a couple storage boxes (bought rest with crowns), ebony motif, some research scrolls. Saving up now, not sure what to buy; the tranny station seems an unnecessary expense.

Paid gold for 6m dummy.

Lusty Argonian Maids

go to the mastercraft mediators. ask them