"Everyone should develop a distinctive style, but a few pieces of advice might be:
Put your brain into gear before opening your mouth.
Never say "we" if referring to a team.
Discipline is essential; fierce concentration is needed at all times.
"Then try to avoid allowing past your lips: "Of course"... "As you can see on the screen"... "You know..." or " I tell you what". "That's a tragedy..." or "a disaster...". (The Titanic was a tragedy, the Ethiopian drought a disaster, but neither bears any relation to a dropped catch.)
"Above all: when commentating, don't take yourself too seriously, and have fun."