Trevor,
Congrats on making the decision to get into RE. Advice given by the other posts are spot on. Other consideration that we've found critical is housekeeping and local handyman. Since you're not in town, you'll need both. They are critical to your success, just note what some of the other high volume posters in this forum have said. Even if the numbers look good, without these two you'll struggle to have success. Speaking from experience, until we dialed in a fantastic cleaner our properties were very meh.
Something to consider for Florence vs rest of the OR coast is proximity to Portland or type of destination. Demand will be lower than those closer to Portland or Bandon for its destination draw. You'll likely see more seasonality than those other locations. On the other hand, probably lower property costs there vs other locations.
We've looked at a couple locations on the OR coast, but as a WA resident adding the OR income taxes have made other locations more attractive for us. Also be careful with the STR regulations being considered in many jurisdictions, do your research.
Best of luck