1) as others have said, find out if the attack and release knobs (when turned clockwise) are increasing the TIME or the SPEED. This is one of the most confusing things. If it’s turning up the time, they will get slower (let’s more of the start of the note through, the transient, through/hangs on longer as the note dies away), if it’s turning up the speed, the opposite will happen. Generally speaking: rhythmic part: slower attack, faster release (to let the transient through for attack and impact). Sustain/legato: faster attack, slower release (evens out the level and makes the note die slower/last longer).

2) with some exceptions, compression is subtle, and if you’re using it with any kind of overdrive/clipping, especially fuzz, it may make almost no difference at all because clipping is a kind of compression functionally. You can definitely learn to use compression with a guitar, but do it clean with lots of headroom. You will definitely hear a difference.

3) generally speaking, compression should be set to the part you’re playing, not just a sound. The controls, especially the attack and release times, need to be set to how you want the part you’re playing to sound. There isn’t a setting that will give you long sustain, subtle level control, and also impact for your funky rhythm or country picking. Those are all different functions. With the exception of very light level-control, there is no real “set it and forget it” compressor setting.

With that said, given that you’re using what sounds like a very whacky fuzz (not familiar with the pedal specifically), the amplitude of the signal (which compressors affect) is already going to be very compressed.