Just for starters, Make absolutely sure the gear shift is in neutral. Connect a voltmeter to the starter to measure the voltage while cranking the motor.
I use old pieces of PVC and tennis balls to hold my cover up. The stripes denote where they go, one stripe is for the bow four stripe is in the stern. Cost was exactly zero.
I helped a friend dump his 25' boat here. I don't remember what it cost and they actually helped get the boat off of the trailer.
https://oclandfills.com/landfills/prima-deshecha-landfill