To give you a better idea of how much time it will take up, this is what you will be doing:
PM's sent to the mule. Sometimes people have questions, but most of the PM's come from people sending in names for the Yellow Wall. If they are just sending the name, the name goes in the Yellow Wall thread. But if they include a story/note, you will have to put that story/note in TDM's journal and then link that journal entry to the person's name in the Yellow Wall list. You've probably already seen how that works out.
Sometimes people will PM wanting to affiliate. There is an affiliates thread on the guild's home forum for that.
Trades. We get hundreds of trades normally. People send us donations, but people also request bouquets to wear from us. If you see a blank trade, it's probably someone asking for a bouquet. Though they are supposed to label the trades, not everyone does, especially those asking for bouquets, I think because a donator is more careful to label trades. xD If people donate loose daffodils, we chuck them in Dumpster Dive in the right number to make a mid-sized bouquet. ( I don't remember how many that is, but deluxe bouquets are super glitchy so not 25.) It's a good way to passively advertise.
Advertising is one of our biggest challenges. We have to advertise but not spam. Affiliating is a good way and so is putting ads in user-made publications. I'll be doing some advertising work too, but I'm just throwing that one out there^^
DWAH usually goes on hiatus during April. In the past it was due to time but it is also for the purpose of drawing attention to TDM. I always get Santa to change our status on THE list, so everyone who reads THE list reads about TDM as well. Santa has even worn the daffodils himself before.