Nowhere in the series does he express any particular preference for one professional team over another... so anything we can suggest is likely no better than a guess. That said:
While he is in school, likely his own, Gryffindor.
After he graduates, likely the Holyhead Harpies, that being who Ginny is playing for.
I suspect his loyalty to Ron does not extend to his cheering on the underdog Chudley Cannons.
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His favourite Quidditch player is Viktor Krum, seeker for the Bulgarian National Quidditch team. His favourite Quidditch team though is the Chudley Cannons. Chudley(Chudleigh) is found in Devon and near where the Burrow is located.
Ron Weasley supports the Chudley Cannons, a professional team. Obviously in school he supports his house team Gryffindor.
Ron, like the rest of the Weasleys, Harry and Hermione, was supporting Ireland. However, he was very fond of Viktor Krum and idolised him. That is until he took Hermione to the Yule Ball.
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Ron Weasley's house is fictional and a postcode is never mentioned.
uh...... PROBABLEY.
Ron's Patronus is a Jack Russel Terrier. The film made a mistake in portraying the dog as a Retriever, but the books are the canon.
Fred's number is 5 Georges number is 6