100,000,000,000 XRP were created when Ripple was founded. They will not make more or less. XRP is destroyed every time a transaction occurs on the network so the amount of XRP decreases over time. They can, theoretically move the decimal point to create more or less XRP however this would not affect relative XRP holdings.
The amount of XRP and be see here:
www.ripplecharts.com
XRP is not mineable but an incentive program for market makers will be announced soon.
Ripple is focused on selling their software to banks and financial institutions. They are also trying to sell XRP to these same agents. Individuals can buy and own XRP but it is not offered on as many exchanges as many other altcoins.