here is alittle info about the fusions
whats a fusion?
a fusion is when 2 ppl from a dragonball serie become one .most of the time they do that to get more strength so they can beat their enemy.they wil have the look of both characters in one.the 2 characters wil get into eachothers body's.  
different fusions
there are 2 different fusions 1 is the fusion that doesent stay long the other fusion is the one that stays  
fusion that doesent stay long
the fusion that doesent stay long stays something like 25 or 30 minutes.then they wil go out of eachothers body.they wil have to do a fusion dance again to get into eachothers body.the fusion dance is a important thing to do or you wont fuse.or get fat or thin  
the fusion thats stays
this fusion wil stay most of the time they have the accesoires to fuse like a earing or however to say that in english.like the one have a right earing and the other a left one.when that activate the warriors can fuse forever.  
a few fusions
Goku + Vegeta = Gogeta
Vegeta + Goku = Vegetto
Goten + Trunks = Gotenks
Piccolo + Kami = Kamiccolo
Piccolo + Nail = Picconail