At the top of the kit building forum is a very easy wing load calculator on a sticky. Go look. Then you have to .Ask yourself what your wing loading is telling you. Some people tend to give wing loading way too much thought and worry about it a lot. If your a kit or scratch builder you try to keep the weight down on your builds but there is a point where you just have to say it is what it is and be happy with it.
The one book I use for scratch building that goes into wing loading is one buy Gordon Whitehead called Scale Aircraft. The book is long out of print but often found at very stupid prices on Ebay.