Picking your bridesmaids can be a pain or a very tedious task. It is usually fairly painless if you have various sisters and a few close friends you've had for a long time.
Ask your bridesmaid if she wants to be your bridesmaid, a "will you be my maid of honor card" will be the best option. Many websites sell these types of cards.
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Sending your bridesmaids a gift if they live far away is a great way to ask them. A good gift idea is to have T-shirts that say "bridesmaid" and "maid of honor" with the wedding date on them and email to your potential bridesmaids, with a beautiful letter or a map.
You can have personalized stationery for several online sites that would coordinate with your wedding or bridal shower theme.
Some brides prefer to ask their maid of honor first, then their other bridesmaids second honor. This gives you the possibility bridesmaids refuse your invitation and even give you time to find a replacement without your other bridesmaids feeling like the second choice if you have to ask one of them to be your bridesmaid.
It can also be nice to have your maid with honor when planning on how to ask your other bridesmaids. No matter how you decide to do, it is guaranteed to be a memorable experience for you and your bridesmaids.