What are the steps to rebuilding my 12.5 hp briggs n stratton carburetor please take in account I am a do it your selfer. Thanks for your help

It is probably the valves. When u try to turn the engine over is there any force when you do it or is it easy to turn the engine over? You probably have to adjust the vales because there is no compression to start the engine

It is easy there is no force. A smell of dead fuel was present, it cranked up right away this morning, then I push in the chock and that's when it went dead. And has'nt cranked up snice