"Is it worth buying a projector and screen to TV, PC, and Netflix etc?"
As long as it's not a cheap projector, and you have a decent screen, yes. Otherwise, no.
"I have been looking at cheaper projectors..."
So, poor quality picture, noisy fan and poor reliability, then.
"not too sure what I need but don t have a large living room"
If you want to enjoy what you watch, then you need the best projector and the best screen you can afford, not some cheapo thing, that will ruin your viewing experience.