Welcome to BF.

I see no question in your post, but I guess you're asking for route ideas.

All depends on how free a spirit you are. Some folks gotta plan nearly every mile, others just wing it. Most fall in between.

As time doesn't seem to be a major factor, you've got the freedom to get aboard and head south without a definite route. Time to stop in libraries to log onto a computer and snoop around the area a bit. Time to visit with locals and find out what they know about what to see and do. Time to explore printed maps and tourist guides for ideas. Time to post specific questions on here and wait for the answers. Time to explore the relevant journals over at CG for ideas.

Check out Slab City as a possible stop on one route you might chose. Funky place.

Better measure your calory needs vs food cost. $15/day is probably doable if you're resourceful, disciplined, lucky, and don't require any amenities that most think are essential for a decent touring experience.

Above all, don't overthink this, and have fun. It'll all work out.