The 23-year-old, signed from Yeovil in the summer, made an immediate impact after coming on for Michael O'Connor in the 70th minute, converting Courtney Cameron's pinpoint cross for the winner.
Agard got lucky with the ball going in off Dons keeper Neil Sullivan's head via the post to extend AFC Wimbledon's winless run to six games and Evans, while refusing to get carried away, believes Agard is fast becoming the perfect footballing role model.
"It was a fantastic header from Kieran and I think the keeper thought it was going wide. Kieran made 70 yards to just be in that box," said Evans.
"The whole dressing room is delighted for that young man; he is everything a professional should be. Any other day [Daniel] Nardiello would get us three or four goals.
"But that happens doesn't it; he missed a chance and always got in a position to have another, that's the sign of a good striker.
"It's not about what happens in December. We're not going to get carried away. We all believe that last week we deserved a point. There was nothing in the first half but I think we absolutely dominated the second half. Arguably we could have scored five or six.
"We can play the best teams in the Football League and we can go toe to toe with them with the players we've got."