Welcome to the forum!
1) use a battery charger to charge at least overnight
2) check your battery connections - remove, inspect lugs for corrosion, clean, re-tighten.
3) The temp light is designed to illluminate while pressing the start button.
4) As Sandman stated, pull the center plug on the left side cover anp put a socket on the flywhel bolt. Turn counter-clockwise - it should be pretty easy until you come up on the compression stroke, where it will get harder until you go past TDC and it gets easy again. If very hard to turn everywhere pull the spark plug and try again.
Do you have a Volt meter and know how to use it? Once the ideas above have been exhausted you'll need to start making some voltage measurements.