Welcome to the forums. I'm pretty new to this hobby myself, so I'm not the most knowledgeable person here, but I can at least help you get started.
You're right about Pyle. They're literally a pyle of crap. Don't waste your money.
That Yamaha receiver you linked is only a stereo receiver from what I can tell. Meaning, there is nowhere to connect any kind of AV equipment to it that I can see (the specs confirm this). You won't be able to connect your projector to it and use it for movies. On top of that, it's only 2 channels so only 2 speakers can be hooked up to it.
As far as outdoor usage goes, I don't have any experience in that department so I can't tell you how good (or bad) those speakers might be. From reading the specs on them, they seem like they'd be OK for your intended purpose.
You might want to look at the used market and try getting a half decent AVR (audio visual receiver) that can power 5 (or more) speakers.
I'm sure more people will chime in here to give you some more guidance.
Cheers.