newbie, think about saving up for Kontakt. Yeh, it's a hefty outlay up front but it will save you money in the long run if you like virtual instruments.
The reason is that anyone who creates a library that runs in the free player has to pay substantial royalties to Native Instruments for the privilege, a cost that is passed on to the consumer. But anybody can create a library for full Kontakt without paying NI, so instruments that require full Kontakt are considerably less-expensive.
Lots of excellent libraries out there priced between $5 and $50, or even free.