 Forbes akapedza basa rake rehudiki neKingston Canadians neSt. Catharines Fincups yeOMJHL, uye akahwina menduru yesirivheri neCanada ku1977 World Junior Championships. Kutevera kunyorwa kwake, Forbes akapatsanura mwaka wa1977-78 pakati peBoston neAHL-yakabatana navo, maRochester maAmerican. Forbes akatamba muRochester ye1978-79 mwaka, uye akadaidzwa neEdmonton Oilers mu1979 NHL Expansion Draft. 