Here is one way to check on which memberships are due for renewal. It involves creating a script which, as a beginner, you may find a bit daunting. You may also wish to tackle this in a copy of your database rather than the original until you are confident you've got it right.
I presume you already have an Expiry Date field, so first you need to create a new text field called "Expiry Flag"and place it on your selected layout.Now, in Scriptmaker, recreate the following script: