I just wonder what "royalty free" really means - you mentioned licensing.
So you have to see if your usage is covered with the license.
You're gonna have to read the license of each of those sites (maybe even each sound file that you download). Many allow non-commercial private use but no commercial stuff. Others insist on mentioning the source. Some want the end product to be (or not to be) creative commons material. Almost all don't allow giving the downloaded sound effects to someone else.
The license studying is the work you just have to do if you want to use other people's sounds. It's also pretty understandable that they don't just give the stuff away if they want to either make a living or a reputation from it.
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I have a nice Sennheiser ME-66, a great directional microphone which should work great for clean sound samples.
Just wondering if I should get a second one and do stereo recordings.
And then there's the recorder. Not sure if you get anything portable with XLR inputs.
The Sennheiser is an awesome mic! If you have such equipment, then definitely try to record yourself. You can also get good and interesting sound effects by mixing things together (most foley is not actually one clean recording, but several sounds mixed together).
As for the recorder: Yes, there are many portable recorders with XLR inputs. One of the cheapest and probably the best value and most recommended is the "Zoom H4n". It not only has pretty good internal mics for ambient sound recording (yes, ambience is important!), but it also has 2 XLR plugs with phantom power and pretty usable mic preamps.
I personally upgraded to a "Fostex FR-2 LE", which has better preamps and is a little tougher and more suited for field recording. But that was mostly because I got it used and very cheap on eBay (at 150 euros I think...).
I wouldn't go for a second mic. While stereo sound is nice for atmosphere recordings (which you can do with the stereo, even surround, mics of your field recorder, e.g. the Zoom H4n), it is not really needed for sound effects. A certain sound is usually recorded mono and you can adjust the pan (or 2D surround position) later in mixing. That is very helpful, because if you use the sound more than once, you might want to have the shutting door on the right in one movie and on the left in another.
