Question about wireless bridges and ip

I am helping a friend out with all the IT relegate stuff at their bmx Track that they've been working on. And we've had some struggles getting good internet speed and more specifically good upload speeds from the local wisp (too expensive to run new coax/fiber, city has denied multiple pathways for it) mainly for remote viewing of security camera but also will be used for guest access on occasions. So we've had the idea to beam internet with something along the lines of a ubiquiti airfiber 60, the gigabeam or even the 60ghz ptp building beam (distance is roughly about 550m from the main track office to the house and we have clear LOS) from a friend down the road and we will pay for their Gig fiber from century link which they will also use for their own network. My main question is what's the best way to set the network up so that we can essentially have 2 networks and they can be on network with their own IPs and we have a complete separate set of IPs for out network and both are invisible to each other. I need to be able to have ports forwarded and also maybe the option to control the ammount of bandwidth per network. For example I allocate them with 150/50 and then have the rest available to us. Theyre a slightly older couple and wouldn't likely need a ton of speed themselves. Hope this makes sense and is allowed. Still learning networking. I have a pretty good grasp on it but somethings I'm still learning a bit here and there as I go.