HI
If you are new to video editing and VP, it's best to keep it simple.
Here are the basic moves that you can try...
Add all your video clips to the media list. (They will be found in the Video File bin)
Add your background music to the media list. (It will be found in the Audio File bin)
Add any image files to the media list. (They will be found in the Image File bin)
Add your video clips and images to the sequence line in the order required. (Drag and drop them there or use the menu options seen when you right click them) You can edit them there as you add them (split and delete unwanted bits) or edit them from the Clip preview window using the IN/OUT markers, and add them with the green arrow.
Click on and close any gaps you have produced.
Click the loud speaker icon at the left end of Audio track1 to mute the complete track.
Drag and drop your Audio File to Audio Track 2 below the muted track and move it L/R to play where you want it to.
Your video should now play with this audio track. This the simplest construction.
If you mute individual clips instead of the whole track (by using the speaker icon shown on each sound clip,) the tracks you don't mute will play with, (mix with) your main added sound track.
As you can see VP has a huge number of options available and it takes time to find out out how they all work. The above suggestion is just a way to start.
Remember to save your project regularly as you work (Use Save as if you want to save slightly different versions)
Best of luck
Nat