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#1
You could drag / drop images into as many
cells as you wish and after the collage is
complete you could remove the unwanted
cells. (right click / delete).

The remaining images can be resized by
dragging the corner handles and repositioned
by hovering your pointer over the image until
you see the 4 way arrow...then you can left
click drag the image into position.

Also, a selected image can be nudged into
position using your arrow keys.

#2
Create a New Blank Canvas...Ctrl / N...

Next... go to...Format / Resize Image...enter the
size you require for the blank. (probably 8.5x11)

Now you can Drag / Drop as many or as few
images on the canvas as you wish.

#3
Also...if you open your images and go to...
File / Print / Print Multiple...you will find a large
assortment of templates.

#4
If you go to...File / Create A Project...you will
find some useful pre-formatted Album Pages
and Collages.