It really depends on how you want to play it. There are basically to methods: picking and fingerpicking, both with advantages and disadvantages. To answer your question, you don't "need" one, but you might want to learn to pick. See related link for more information on fingerpicking if you want to go that rout instead of picking.
Just one. Get a bridge pickup.
An acoustic that still has one or more pick ups. A semi acoustic (semi electric) guitar has a hollow body and can be played as an acoustic guitar but it also has one or more pickups which means that it can be played through an amplifier as an electric guitar.
when you pick the strings it goes threw the hole in the acoustic and hits the wood and makes a sound
yes an electro acoustic guitar needs an amplifier as the pick mounted underneath the bridge can only act as a microphone, to get the sound amplified a user should use amplifier for the accurate bass and tone.
anywhere on the strings below the nut and below where your hands are on the neck
An electic guitar can use any pick, as a acoustic guitar can use. If you want to strum you want a flismy pick, or a small size. And if you want to pick the notes your going to want to have a hard pick, or a large.
Acoustic guitar is what it says acoustic, none electric makes the sound from the guitar body/chamber. Acoustic/electric or electro acoustic look the same as an acoustic but have a pic-up fitted inside the body to link to an amplifier. A Semi acoustic guitar looks more like an electric guitar but with a hollow body or chambered body with pick-ups mounted on the sound board of the guitar.
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An acoustic guitar is played by plucking the strings by hand or using a pick to move the strings. The sound varies based on the string chosen and how hard it is hit.
Using a pick on an acoustic guitar is very common. Whether or not to use one really depends on what genre of music you are playing.
Beginner's Acoustic Guitar in a Bag
Beginner's Acoustic Guitar in a Bag