It is great to be prepared for the upcoming flu season. Your doctor and pharmacist are great resources available to help you.
The Centers for Disease Control and Prevention (CDC) recommend a yearly flu vaccine for everyone 6 months of age and older as soon as it becomes available. Many pharmacies and doctors' offices receive the flu vaccines in August. This is a great time to receive the vaccine because it takes about 2 weeks for it to become effective, and flu season generally begins in October.
The CDC expects shipments of the flu vaccine to begin as early as July or August. I would recommend checking at your local pharmacy or doctor's office in August to see if they are available yet.
As with any vaccine, ask your pharmacist and doctor any questions you may have.