First, check your telescope indoors. Make sure you can adjust the vertical and horizontal position, that you know how the focuser works and how to change and secure the eyepiece.
Take the telescope outside in the daytime and fit the lowest power eyepiece. This will be the one with the highest focal length written in mm on the side. It will be around 25mm.
If you have a pair of binoculars or a telescope, practice focussing it in the day time by pointing at a distant object like a tree or aerial but definitely not the sun.
If you have a finder scope, learn how to align it so that the crosshairs match what you see through the lowest power eyepiece.
Learn how to find things that may be upside down and swapped left to right.
“The longer you look through an eyepiece the more you will see.”
If you have different eyepieces, learn how to keep them clean (don’t touch them) and work out which is the strongest by looking at the number on the side.
Find out what happens to the light as it passes through your telescope.
When you are ready to use your telescope at night, target the moon first. Then the Pleiades, the Orion Nebula and the brightest stars.
Tweak the alignment of your finder.