Roadtrip to Norway

Hi, sorry for repetitive post, i find some posts about this topic, but i am still not sure about the result and i don't want to have troubles.

So basically. We (me and my partner) are planning road trip from Czechia to Southern half of Norway in following days (Oslo, Trondheim - maybe, Bergen, Kristiansand) and we were planning to sleep mostly in our car. But i found out that it is little bit harder to find right place to stay over night. We will stay only in Bergen for 2 days, else we will next day be on road to next destination. Should we park only on places with Camping sign? How often they are on roads (it is hard to find or it is common to just stumble on some place on roads)? Is there any good map where are those places visible (or using Google Maps is enough)?

And for second part. Can you give us some ideas what to visit on that road? We are planning to mostly visit nature (National parks, go on hikes, etc.) and enjoy some scenic roads. I found this map of scenic roads, https://www.nasjonaleturistveger.no/en/routes/gamle-strynefjellsvegen/ .

I will add that we will have like 9-10 days top for Norway, we have to get to Norway and back home.

We are really look forward to visit Norway. <3