Where do I find the value of all the crypto currencies, currently in use?
What factors influence the strength of these currencies?
In your opinion, will the rest of these currencies also reach the level where Bitcoin is now? And is Bitcoin the strongest, because it was first? Or
because it is used most?
Help me understand the basics first
You won't find the values of every currency. Cryptsy carries most of them though.
The factors that affect each currency are the same ones that affect any business. Speculation, marketing and adoption.
None of them are likely to reach Bitcoin's success. At least not for a very long time. And Bitcoin was here long before the others were and has hundreds of millions backing it.