How can i contact the dead i really want to know because i have be havin these really wierd senarios?

i realised this ages ago but i never took notice i could think about what was gonna happen before it did yestarday i was pissed off with my mum and i said she better phone she did ok it could happen =/ but i was walkin my dog and my dog left me for a while and he left me i tried to find him i walked into a peice of woodland i stoped i herd ppl talkin and i looked down and my dog was there but to be honest no 1 was in that part of the woods and i no tht for fact becaus i own it! help please