quilting amount is dependant on the batting being used- some batts need to be quilted every 2" some allow up to 10" between quilting lines- you need to read your package & quilt the recommended amount.
you quilt your borders before binding- binding is the final step after all quilting is completed & the quilt is squared up...the quilting process distorts the quilt a little & there should be excess backing/batting to be trimmed after the quilting is completed- after that a label & the binding is attached...and Voila---it is done!