Tapping fingers: Give them sticky tack to rub back and forth with their fingers. My personal favorite brand is:
This brand is much stickier than the yellow and white brands. It gives a better sensory experience to your students.
Wiggling in seat / falling out of seat: Try using a exercise ball as a chair. If you have tile floor, you'll want to get the ones with sand in them so they won't roll away. The balls come in different sizes and colors. My daughter's teacher had balls donated to her class so every student had one to use. When her teacher's gym got new ones, so they gave her the old balls.
If you can only afford to buy one or two balls, set up an "office". The office is away from the class (as much as possible) there is a desk, ball chair, headphones (are great, too) and box of school supplies. Use bookshelves or chart stand to enclose the area. Explain to your class the purpose of the "office". It's a place to work when you feel like you need a quiet place. It's a place to help you, it is not a timeout or place of punishment. Students may ask to work in the "office". You will be surprised at how well this will work with your students. When students see this as an area to help them, rather than a punishment, they buy into it more.
This summer, I encourage you to read a few articles or books about girls with ADD / ADHD. They present their symptoms much differently than boys. Here are a few suggestions:
This is a great website, full of helpful information.
Here are some books about ADD/ADHD: