Clubs are good to network, at least try it. I joined a club shortly after I started and didn't care for it much. Frankly, I prefer the solitude. That being said, I hunt almost every trip with my brother. We're both introverts to begin with. We meet at the location, say hi etc, put on our headsets and might see or speak to each other 4 times in the next 5 hours. At the end of the hunt, compare finds, discuss our next trip and adios.
I do believe one of your problems is people are reluctant to share good locations. They're hard to find and then get permission etc. After weeks of research, looking at maps, reading books, getting permission and finding access, I know I'm not thrilled with having some unknown personality, show up and jump on my efforts. I've done it but only with a select few.
If there's a place that sells metal detectors near you, query the sales guy about people that bought them, does he know them, give him your number and ask he give it to those guys he knows. You might get lucky.
I'll bet if you posted on here your location and said you had a banging, old spot you'd get a taker.