There are lots of county, state, and Forest Service campgrounds along the Oregon Coast.
State Parks have electric. Some county parks have electric. FS probably not. Here's a good place to start looking at Oregon State Parks.
That's a good time of the year to visit. Smaller crowds, State Parks are what they call the "Discovery Season", meaning lowing camping prices.
Sights to see..
Forth Stevens ... The old Fort and the wreak of Peter Iredale.
Tillamook Cheese Factory Near Tillamook
If you're into aviation just out side of Tillamook there's a great museum.
A stop at Depot Bay is a good one. The fishing boats have to navigate a narrow channel, there's foot path under the bridge where you can look down on the boats as they come and go.
Next is Newport where the Oregon Aquarium is located along with the U of O marine sciences center, both open to the public. I haven't visited since NOAA moved so they probably have a visitors center also.
Various day parks with differing views of the ocean and many sea birds.
There's several light
houses that can be visited.
On down the coast is Sea Lion Caves. It's private but interesting.
Oregon Dunes Nation Recreation Area is another place that's interesting.
Darlingtonia Way Side where carnivorous plants grow. Don't worry they only eat insects.
Don't forget all the little art galleries, and taffy shops.
You could spend a lot of time exploring the Oregon Coast.
Enjoy your trip.