I have included a set of illustrated instructions (See below). These should step you through the process of installing the head of your Kohler engine. I am not sure if you have bought new head bolts but it is advised to install new head bolts when replacing the head gasket. Per the repair manual, the coating on the bolts will come off and will not tighten correctly. I hope this is helpful.
Here is a link to order any parts you need.
Sears Parts Direct