I would study your engine room and imagine having to work on the motor. Any components that are impossible to get to I would replace with new. Fuel pump or starter in my case..
Looks like you may have the wrong prop and certainly some mis-matched parts. I know only what mine looks like and that ain't it. The shaft is probably ok with a bit of work..
Something don't look right. The nut is too small for the locking ring. You may need to remove the prop and be sure all the parts for the hub are there..
If you feel you can DIY there are many here that will guide ya. If you are not of that nature then find a mech who is better than the last one...
I have crapped out many times but I learn from the folks on this forum. many have done this stuff for a livelihood and are willing to help...
Welcome...
Pack rats all of you! I been that way all my life, there is no cure until you cross the Styx and then, sadly, a library is burned..
I thank all here for the knowledge giving..