Tonight is a good one to start on the Moon with! The current cloud won't be a problem with it.
Take you new beast outside & mount the finder scope (you may have done this already).
Look at your new eyepieces and identify the one with the largest number in mm. That will be your low power EP. Insert it into the focuser. There may be two little screws under the focuser, loosen a little the one closest to the scope if it is tight - it will allow the draw tube to move when you turn the focus wheel.
Aim the scope at the Moon using your finder, centering it on the cross hairs. Look through the eyepiece in the focuser. If the Moon isn't in the field of view slowly move the scope about back and forth, side to side. Take your time and you will find it.
You can now centre the Moon in the finder scope by adjusting the two adjustment screws on its mount.
Then experiment with the different eyepieces and see what they do with the Moon.
Don't worry about "collimation" tonight! No use with the excitement you'd be feeling,
When the stars are up, have a look for Saturn. It's easy tonight. Look straight up around 7pm. There will be two bright stars close to one another. One of them will be Saturn. Use your low power eyepiece to locate it (along with you finder first!). If it isn't the first star you've looked at it will be the second. You won't forget your first look at this bad boy!
Enjoy.