Now that you have all your squares made, lay them out how you want them to be in the quilt. Have adjacent squares have the bars alternate whether vertical or horizontal. See pictures above and below for ideas.
Fold the second column on top of the first column with right sides together. This will help you stitch them together in what is called chain piecing. Then pick up each pair in order. Make sure you do not turn them so they will be the way you want them.
Stitch each pair together without cutting the threads between the pair. Then open each pair up and pick up the third column. Attach the appropriate square to each pair of squares. Repeat with the other columns until all columns have been added.
Next you need to trim the top so the sides are as straight as possible. Then measure it. Cut a backing in a fabric that you will want to be your edging and make it a couple of inches larger than the top. If you want to use a batting you should make that bigger than the quilt top as well. I used a used dryer sheet as my batting but have also used a piece of flannel. Put the backing fabric with right side down. The center your batting on this piece and then center the quilt top (correct side up) on top of that. Pin in a couple of places. You are now ready to quilt it. I machine quilted just a grid over it. I used clear thread on top and a bobbin thread on the bottom. I did my best to "quilt in the ditch" which means sew along the seams.
Now to do the edging. Trim the batting as close to the quilt top edge as possible. Then trim the backing so there is half an inch more on each side. Start with one edge and fold the corner down diagonally (see picture) making an isosceles right triangle. Snip a square out of this triangle. Then fold the side down and fold it over the quilt. Pin. Repeat for all edges and corners. Make sure you pin everything before sewing. This should give you the look of mitered corners. Then stitch all the way around the quilt. Again I used the same thread as I did for the quilting. Trim any lose threads and your quilt is finished.