Is there a way I can open a dog rescue?

That is not a dog rescue. A dog rescue does not "rely" on donations and does not help for a "fee", a dog rescue is started by someone who IS the donater, they pay for toys, food, crates, etc. If you would really like to help i suggest you foster a dog at a real dog rescue, that means you go to a rescue and you care for a dog that they have up for adoption, it helps make space for new dogs to come in. Techanically it is not adopting you are just caring for the dog UNTIL it gets adopted.