You have a stringer. The tilt is only used to get the outdrive up. If you need to run the motor with the drive tilted up, only at idle (600 rpm). It will tear the ball gears up.
The trim is for adjusting the trim of the drive.
My guess this is a new to you boat. I suggest getting a factory service manual. You will need it, especially to replace the ball gears and the 3 piece vertical driveahaft that will fail on you
here is the link to get a factory manual. https://outboardbooks.com/
really wish you would have come here to the forum prior to your purchase.