1) from the information you've given your battery is dead... charge or replace it.
2) DON'T randomly short wires to battery plus... yellow to battery can often damage the CDI - If you don't hear any click from solenoid after a good charge or jump, you have. Ask me how to fix it.
3) if you got it with rec/reg unplugged the seller screwed you - the stator likely has a short and needs to be replaced. But that won't prevent you from starting (as long as you unplug the rec/reg again).
2) DON'T randomly short wires to battery plus... yellow to battery can often damage the CDI - If you don't hear any click from solenoid after a good charge or jump, you have. Ask me how to fix it.
3) if you got it with rec/reg unplugged the seller screwed you - the stator likely has a short and needs to be replaced. But that won't prevent you from starting (as long as you unplug the rec/reg again).