Some people get a mild reaction where you get a slight reddening of the skin, a minor bump, and it's tender for a day or two. It's an intramuscular injection, so you'll get it in your arm (for those that are evil, it's in the area of the arms that most ppl punch to give charlie horses)
The flu shot is composed of most of last years strains, and the most virulent ones from years past (all dead of course so just the materials your body needs to recognize and produce immunity).
It's normally a good idea to get the shot since it'll help jump start your body for the flu season (starting next month or sooner), especially for young childern, the elderly, and immunocompromised. Lastly, the influenza virus mutates very often, so just because you get the shot, doesn't mean you won't get sick this flu season. However, it could mean you'll recover faster or have reduced symptoms.
Check with your employer as well, since a lot of companies offer free flu shots. Government and especially those in Health are among the first to get it free.
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