I need to find out the correct oil to gas mixture for my Toro 25cc weedeater?

I would check manual, 50:1 may be what it needs, could be 25-100:1. To lean will not be good for the engine.
Found this:
https://homeownersolutions.toro.com/...2&userID=19461

I believe Stratmando is right. The one I have is 50:1. Found this also if it helps:

Toro 17" Attachment-Ready Gas Trimmer
Model Number » 59150
Power » 1 hp
Engine Size » 25.4cc
Engine Type » full crank
Fuel Type » 50:1 2-cycle
Weight » 12.5 lbs
Line Type » 0.095 in.