About Selling Photos...

Some stock photo sites have a model release form to use. If not, just do a search. There are plenty of templates to download you can use. Property releases are only required if it's branded or easily identified. No names, addresses, signs. Conversely, public or iconic buildings, structures, or property (ex. Eiffel Tower, Taj Mahal, Golden Gate Bridge) are considered public domain and no release is required. The same applies to famous persons such as celebrities, political figures, athletes, etc. If you want to sell photos, there is no alternative or workaround other than keep your pictures generic. Upload your photos. They go through a review process before accepted for sale anyway. If there is a problem or release required, they will let you know.

You can sell free images from pixabay.com where we don't face copyright issues.

Maybe Pinterest or Pixaby and other free photo websites.

sites should have that info. model releases are required when you use models. not needed for regular people out in public like a public park. photos in public places need no permission.

I only upload food photos most of the time. Beach photos without focusing people's faces and birds to play safe.

With the person, you just ask the person if you can post it. Most photographers talk to the client or model before taking the photos and have them either sign or agree to let the photos be used for marketing reasons or to just be posted. That is pretty standard for professional photographers. From my understanding of properties if it is a private property then you would need permission from that person but most public places are fair game and that includes buildings, parks, lakes, and just normal landscapes.