Hi Moses, and welcome to the forum!
For Northern ponds where fish harvest and low management needs are your goals, you could do the typical CC, BG and LMB route. Your CC and LMB could keep your BG populations in check, and with a little corrective nudge here or there you could achieve a relatively balanced fishery. These fish are easy to source and cheap, if not free. If you happen to become LMB heavy you can always cull and fillet them, too.
Crayfish can be detrimental to your pond, it depends on the species. If you have a stream or other ponds nearby you'll likely end up with that species of crayfish anyhow - they do have a tendency to travel and populate new waters. Might want to trap a few in a nearby stream and provide clear, up close photos of it top and underneath and their pincers. Cody should be able to ID it for you.
Keep us apprised of your construction project and we'll be here to help with your stocking strategy when the time comes.