great start, my tip would be to use the darkesst blk film on the back windows i think its called limo blk halfords do it, that way you can look out and no one can see in but use limo blk anything lighter still allows ppl to see in , ive got limo blk at even in bright sunlight its hard to see in unless you look close up to the window, so i got a lighter shade a doubled up so no i can still see out but its inpossible to see in. and then you can still use your rear view mirror when your driving . when you have a van i think its inportnat to still get as much light in as possible as it makes the space feel bigger.