Don't worry I was like that when I first started you will get the hang of it. You need to choose your proffesions I would recommend Leatherworking and Skinning if you are a shaman. Just go to a Thunderbluff guard he will point you in the right direction.
Weapons: Shamans can use a range of weapons (I don't have one so I am not entirely sure) and they can use shields.
Items: They can wear leather armour and then mail at level 40
Hope I helped I didn't put much if you have any questions just ask me or AFM.