02 400 scrambler 2-stroke rebuild

Hi, this is my first time on this forum and need some help. I need to rebuild at least my top end. I have everything tore apart and out except the crankcase. I'm trying to do it myself because I want to learn more about my bike and motor and add a few extras to it.

1. The rod on the crankshaft that holds the piston has no play in it except from side to side, maybe a 1/16" no more then that. Is that okay?

2.I was going to put a stage one kit on it once everything was rebuilt. I understand that clutching comes with the kit, where exactly does this go? Does it go where the drive clutch goes? If so, is that easy to put back on.

3.Once I have the cylinder honed and start putting back together is there anything I need to be very careful about? Like how tight I should be tightening the bolts down or the sequence I do it in? Should I be putting anything around the piston or in the motor to help the break in process?

4. Should I take the bottom end out as well? Is that fairly easy to do? The only thing that concerns me is taking the drive clutch off.

Any other information would be great, this is my first time doing this and really want to learn how without screwing up anything. I really appreciate your help and insight. Thanks