I am a new Druid, level 7. I was curious if I should use 1h mace, 2 hand mace or a Staff?

Train al lyr weps as you get higher you will have many chocies ... whether you are feral, resto or balance makes a diff ... seems that many higher level weps are staffs and 1h mces

You can train Daggers as well, there's a nice dagger that drops in Scarlet Monastery.

But in the higher levels, the staff is the way to go.

Fist weapons, for horde Druids, can be trained in Orgrimmar. This may be nice later on in the expansion with the introduction of more, and better, fist weapons.

Fist weapons are trained in Darnassus for the Alliance, which isn't far either. Currently, there are no decent fist weapons in the game that really help druids because most of them, currently, are based around "Chance on hit:" effects, and all we care about are stats and "Equip:" effects. Unless you manage to find a caster/healer fist weapon (I haven't come across one yet.)

But of course, as Arestavo started to mention, there might be more fist weapons that are of more use to us in the expansion.. besides the fact that in the expansion rumor has it "Chance on Hit:" effects will work for druids in their animal forms.

I use a 1h mace in druid form (healer) a staff in druid (caster) a 2h mace in cat and a staff in bear so id say use mutiple weapons in multiple forms and don't worry about daggers or fist weapons right now.