I have to give you credit for asking......

3 days is a long time for a newby since it's a psychological shock to the newby. But 3 days isn't all that long. For instance, many of your questions imply gathering or catching food. After you do some reading you'll find that you mostly won't really require food for a 3 day survival period.

You DO need to know how to stay warm & dry and hydrated. Those items right there can be a big job if you don't have much equipment or know how to use what you have.

As others have said, unless you're filming an episode of Jackass Survivor, please start small with Boy Scout info and work up to 3 day adventures.

Unimogbert