Procedure by it self it is very easy but mental path can make you dome troubles. Procedure: On altar whic you made for certain god you wish to sacrafice for, you light candels (the best it is outside if possible) then you pray and ask them for a favour or just thank for all what you have. Then you light ritual pot (if you made alltar for one use you will burn whole altar ;). Then comes fun part: you dont need to kill sheep or ram you justcburn very valuable thing for you (100$ for example). If you did it good, gods will reward you.