I got a kit for growing bonsai's
I consider that a false advertising. There is no such thing. You got a kit that contains seeds to grow trees. Bonsai will not grow from it all by itself. It requires at least some horticultural knowledge, lots of study, training and technique - and patience. Growing a pre-bonsai pine can take some 15 years - for a small, not so interesting one. Real good bonsai pines will take longer than that.
You cannot put it outside now. I guess you should let it grow stronger for a while (if it still wants to grow), then move it to the fridge once it is strong enough, until spring. Not sure myself, never done it this way.