What is the struggle REALLY
If you are under 25 very hard and expensive to rent a car.
You could do this by Amtrak trains.
You start with getting a MAP Google has a good one.
You plan to get up early and just go. Breakfast down the road. Your choice to take the freeway/motorway and just get from one place to the next or take the side roads and explore a bit.
Obviously you are not used to driving hundreds of miles at a time. For one driver plan on about 300 miles per day. I assume you actually want to get out of the car and do some stuff
A one way car rental can be expensive
.Renting a recreational vehicle? Your hotel room on wheels?
Shall we all guess if you want to spend hours staring at the Pacific Ocean , exploring some winery, climbing some hills or mountain?
San Francisco is expensive to park in. Recommend you stay just outside the city and ride Public transportation for San Francisco.
As a tourist do not expect to be driving top speed the entire distance. Your on the road driving time is closer to 20 hours. Three driving days for ONE driver.
For planing purposes plan on no more than two sightseeing things per day.. Each takes 2-3 hours from the time you park and then on your way to next place.
Oregon caves is a nice stop.You can use this stop to switch between either the coast road slow with nice scenery or the faster route that also has good scenery.
Redwood or sequoia forest are worth a stop. The trees are really big.
Suggest you start reading the various tourism websites and make a list of the things that are of interest. TO YOU.
You then research a bit more and narrow it down. Leave a little time in budget for the unexpected thing you find along the way.
If this is a one way trip you have lots of time. If going on a return drive allow more time for the return. No need to be racing to Airport to catch your flight.
DO NOT plan on doing very much your first day. JET LAG happens and you deal with it.
About 1000 miles One way not too bad.by North American standards. Things of interest can be a hundred or miles apart plan for this travel time.
Train not the best Just once or twice a day. for most places along the route. The train is a great ride. Seeing stuff along the way usually means a 24 stop and then figuring out how to get to and from station. Limited public transit between cities on the West Coast.
Just a wee bit more information from you can get a much better answer. Up to you if you just want to drive and watch things pass by the windows.or get out of the car and do something.What is it you might want to do.? Hike to a hot spring for a swim.a bike ride, maybe you want some white water rafting?
You budget for sleeping? You do not really need all the extras every night. A room and bed for most nights is more than enough, Splurge for the extras near the end of trip if you have money left.