Once you get your shelves in (everywhere you can cram them in my case) it is time to think about how to organize what you put on them.
For this, I am a HUGE fan of see through boxes. Most of mine are Sterilite, though there are many brands to choose from. Clear containers are the only way to go. You want to be able to see what is in your boxes with as little work as possible!
You can buy these boxes anywhere from grocery stores, to big box places (they have the best prices) I purchased many of mine online here, buying in bulk you get the best price. Try to choose the squarest boxes you can find and make sure they "nest" well. Boxes with large round corners or domed lids may look "prettier" but take up much more space than the plainer ones, and worst of all, they hold less!
After learning the hard way, I now have 2 boxes I can't live without, you can see them in the photos. I use these small boxes for storing the tons of bags of rhinestones I have, things like snaps, and small tools. The medium boxes hold everything from spools of ribbon to completed pouches, my children's art supplies, patterns, fat quarters etc.
You can also see in this photo there are some very inexpensive (.99) hinged lid pencil boxes with colored lids that I picked up at my local big box store. I use these for sharpies, buttons, rotary cutters and their blades etc.
I also use some larger boxes up high to store light stuff like yarn, fiberfill, faux fur and fleece. You don't want to be on a ladder taking down really heavy stuff!