Kazu played the full 90 minutes of the 2-1 win, with goals from Matthew Etherington and Mark Hughes cancelling out a first minute strike from Jack Lester.
The Japanese international featured in the midfield anchor role and appeared to adapt comfortably in front of the travelling media from his homeland.
"He did fine," said Colin afterwards, before adding that clear communication will be vital to his progress in the coming weeks. "You can see that he is more than a decent player and he's doing alright.
"We've just got to make sure that he understands what we're asking for and anything that he expects of us."
Colin avoided using a certain cliche, but admits that his side's second half showing did not match that of the first period.
"There was a lot of good things in the first half, but the second half wasn't anywhere near. It was a little bit scruffy and we never really got going. They were better than us in the second half.
"Fortunately, the one thing we did do was defend our area very well. The three boys at the back did excellent in the second half and made it hard for them to get shots in."
Lester opened the scoring for Forest in the first minute of the game when an offside ploy went wrong, but the team responded quickly and were ahead by the 28th minute.
"We were very sloppy to start with, going for an offside off a flick-on, but the boy missed the ball and the fella they were trying to play offside couldn't be.
"From there the rest of the first half was good with two good goals."
The second goal from Hughes came from a free-kick routine straight off the training ground involving Johnnie Jackson David Galbraith and Hughes - Toda also looked ready to receive it in a more central position.
Forest were totally foxed when Jackson overran the ball and Galbraith tapped it to Hughes to curl into the top left hand corner.
"We were doing it this morning actually. It was funny because we said we'd give it a go but you never really expect them to come off. It was executed very well.
"It is pleasing when something that the boys have worked at comes off - they were delighted."
Colin Calderwood was delighted with the impact made by Kazuyuki Toda in his competitive reserve debut against Nottingham Forest at Stevenage on Monday evening.