Hang in there !
Here are some simple things that can be problems , the spark plug wire screws into the rubber boot , sometimes you have to unscrew the boot , cut 1/4 off the spark plug wire and re-screw the wire in , it can have a bad connection there
Unplug every connector along the wiring harness , this may require removing plastics , and check for corrosion and apply di-electric grease
Check for voltage across the fuses with a test light or meter , seen where the fuse is good, but a bad connection doesn't let the voltage thru
The kill switch may have corrosion in it , you can take a can of WD40 or shuck , use the little straw and spray generous amounts into the swiych while you work it back and forth to flush out any dirt or corrosion
Make sure the battery terminals are in the right places , clean and tight -- also the ground cable where it attaches to the crankcase clean and tight
