A few simple principals apply especially to borders:
Use similar amounts of quilting in the border and the center of the quilt.
Straight lines parallel to the edges are hard to keep straight.
To mark quilting lines start in the center and always measure from the quilt rather than from the previous quilting line.
Quilting shows well on fabrics with no or very little pattern - this is the time to show off.
Possibilities for design placement include one border or several borders.
Quilting does not show well on busy fabrics - a wonderful place to practice your skills.
When hand quilting, to avoid stretching the edges, baste a towel to the edge and then use your regular hoop.
Six Blonde Ladies