Here is my 2ยข. YMMV
If you are concerned about corrosion in the brake lines, run denatured alcohol through the hard lines after draining (and removal), blow out with compressed air, and spray fogging oil into them. Prior to re-installing, used the denatured alcohol and compressed air prior to re-installation. Use rubber plugs/stoppers on the master cylinder, front calipers, and wheel cylinders to prevent contamination while in storage.
As far as draining, have a quart jar or oil catch can handy. Remove the caps at the master cylinder. At the left rear, remove the hose from the hard line. Use a rubber cap when you're done if you want to prevent a mess during removal. Repeat for the right rear, right front, and left front.