[Rwp] Some sound font libraries with audio effects

[germano carella]

Hi to all,
I need some soundfont library with sound effects such as ambience, 
horses, spades, for a radiodrama I'm recording.
During recording I must send sound effects on headphones, so I would use 
midi keyboard for this purpose.
I never used midi in reaper, so I don't know how to set up sustain for 
playing sound in loop mode.
I need also soundfont library with some effects, I have onlyu instruments.
There is a library can I buy, for example?
Help is apreciated!
Germano