Hi
Your post seems to suggest you are creating a slideshow and so will probably want to have a transition between each slide. You CAN do this manually one at a time but that's a bit labour intensive with so many photos.
So... Before you add your images check their default duration time. This is found under Tools/Options/Media. Set the default image display to something suitable...say 8 seconds.
Now set the default transition duration under Tools/Options/Editing to something a bit less. ..say 4 seconds. This means there will be around 2 seconds of transition at the start and end of each image. With these values each photo will display for around 4 seconds
Once you have got all your photos onto the timeline as outlined by Borate above, click the first image on the timeline to select it. Press the SHIFT key down. Keep SHIFT pressed and click the last image on the timeline. This will select ALL your photos.
Now click the tab on the top toolbar marked Transitions. Slide the cursor down to the Fades option and in the next menu select Cross Fade. (You can select ANY type of transition but Cross Fade is OK as a starting point.)
You will be notified now that you have selected multiple clips. Click "Apply to All". If you have just photos on the timeline then from the next option that comes up select "Freeze clip location". If there are video clips in your selection select "Move clip location"
You will now see that VP has placed a Cross Fade between each of your photos making a much smoother slideshow.
You can manually change any of these crossfade transitions for a different transition if you wish or change the duration of individual transitions or the duration of individual photos by going into storyboard mode where the time values are displayed.
Nat