Well, enough to see that getting the team names will not be possible without another select - unless some guru comes and puts me right.
Does that give you all the info you require?
How about something a bit more trivial till then?
Does that bring out ref's names and a prettier date?
SELECT date_format('%a %d %b %Y', fixture_date) as nice_fixture_date, fixtype_id, age_group_id, home_id, away_id, kick_off, referee_id
FROM fixtures LEFT JOIN referees on
WHERE fixtures.fixtype_id =1
AND fixtures.age_group_id =15
AND fixtures.finalised =0
LIMIT 0 , 30