The 21-year-old played in a central midfielder role for David Moyes and scored a double as the Black Cats edged QPR 2-1 at Loftus Road.
The goals were McNair's first in senior football and he was thrilled to have contributed so early in his career for the club he joined from Manchester United just last month.
"It was a good night for me personally and obviously for the team as well," he told safc.com.
"I thought we deserved the win to be honest.
"We've got two games coming up - Crustal Palace at home and then West Brom - so hopefully we can take six points going into the international break.
"It's brilliant. It's great support and it's great for the fans to see us win as well."
Regarding his goals, McNair commented: "Someone said to me midweek, 'any chance of you scoring?', but now I can text them and say I've scored two."
And of his integration into the Sunderland squad having arrived from United in early August, the Northern Ireland international added further: "It was difficult the first couple of weeks.
"I came from Man United and hadn't had a pre-season. It was a big change and I want the fans to be patient with me.
"Hopefully I showed tonight what I can give the team.
"The lads are great around the training ground and outside, helping me settle in. They are a great bunch of lads."