Are you planning to hire a car ?
By road would certainly be the most convenient. Plouasne is a bit off the beaten track and it must be about 100 miles from the airport.
Long distance travel by bus is rarely an available option in France.
So the only other alternative would be to look at trains which would first mean going into Nantes. St Brieuc is the largest town to Plouasne from there a combination of local buses and taxis to your final destination.
Take a look at www.voyages-sncf for trains.
If by any chance you are going to prebooked accommodation or to visit friends I would contact them for final, local details.
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