What materials are needed by the guild depends on the buildings we are working on. You can check out guild buildings in the wiki.
Next buildings will probably include Guild Hall VII, Vault III (or was it IV?), Dark Tower and perhaps the next level of Warehouse (IV I think). Also the Guild can produce charms that the members can purchase if they have enough guild honour points (which you earn when you help build the buildings). For this we will need crafting materials.
Don't dump materials at the guild that are not asked for on the guild page (guild message or tracked buildings), because the warehouse capacity is limited.

Generally, only thing guild needs is build regurarly!
Emancipate can take care of the resources

As was said before, building every day is what is most important for the moment. Eventually we will need higher level materials and things that drop from dungeons that Emancipate may or may not be caught up to level wise on his alts, but right now he is doing an AMAZING job completing needed materials.

Can you build before level 10 or just not donate? Whoever is sending invites just make sure we leave at least 1 spot to rotate team emancipate in/out.