I had difficulty in the beginning to understand where I started.
Here I will try to explain it all started to get the addresses.
1-) Download CheatEngine
2-) Open Cheat engine, open Tibia and attach (clicking at computer)
3-) Login in tibia
4-) Get Id of you helmet (to me is dark helmet: 3384) but you can consult this link: http://otfans.net/threads/135415-Tibia-Item-ID-s
5-) Put the Id at field where have a label: Value
6-) Click First Scan
7-) Now remove the helmet and put the bag
8-) Know in value put 0 and scan for NEXT SCAN
9-) Now you have the Head Slot. Put again the helmet and look if the value (left window) has changed. If has, you done, go to step 10, if dont, you make something wrong.
10-) Click twice in address (left window) then the address go to bottom window.
11-) Click twice at addres and will open a message like: 0x000000 + Tibia.exe (0x000000 is just a example).
12-) You ready to get others values. Good Luck.
Sequence:
http://imageshack.us/g/266/attachprocess.jpg/