Hy everyone I'm trying to create some western music like spaghetti western soundtracks. How can I play the classic whistle and guitar in the background?

Hello everyone im new in this kind of music im trying to create a Sinthwave song from zero.
im searchin free VST and Drums like the ones in this video: (I cant find it on my LMMS presets)
https://www.youtube.com/watch?v=Ib0Kypo0l-g