I use the 505 all the time. This is for small items only. I have a frame to quilt all lap and bigger quilts. What I do is - lay the backing down and iron it - starch it flat - spray - not too much -lay the batting down and smooth with your hands many times until there is no more give to it - lay the top on the batting. The top has been starched so it lays smooth and flat. Smooth with your hands again so there is no wrinkles or give. Pull half of the top back and spray that area. Now, pull that back onto the batting and smooth that in place. Next - pull the other half back and do the same thing you did with the other half. Sometimes it takes more than just halves.
When I get done spraying and smoothing, then I iron both sides to get the whole thing flat. I iron it from both sides. Just remember not to use too much spray.