By Car: Take any bridge from Ottawa to Hull or Gatineau. There are usually signs that say "Hull". Once in Quebec, the highway will be identified as Highway 5 to Maniwaki. Take Highway 5 North until the end. Then North on Highway 105 until the exit for Wakefield, at which you should make a right turn. It takes about 30-45 minutes depending on the traffic in Ottawa.
By Bus: Greyhound goes from the Ottawa bus terminal to Wakefield once per day and takes about 1 hour and 15 minutes. A return ticket is about $15.