What Illuminarti said. That's what I wanted to say.
That space under your print bed - it's purpose is to keep a notebook with notes on every print you ever do so you can go back and say to yourself "what did I do different on this print that it came out so well?". Or "so poorly".
In what ways is the quality disappointing you? I have no way to know what your expectations were, but if your printer is working ok, and your expectations were even half-way reasonable, the I'd expect you to be pretty blown away with you new printer. I know I certainly was. So I think there's a reasonably good chance that there are some problems that need fixing, and I think it would be a good idea to work on that a bit before trying to get more adventurous.
There's no one simple answer to the question of what settings to use. Different objects need different settings based on the type of object, and the challenges that each has. There are not really any simple answers as to what settings work best. It all depends on the object, and how well calibrated your printer is. Generally speaking, slower prints will work better than faster ones, and thinner layers will look better than thicker ones. But both of these things can be taken too far... its rare for me to print much thinner than a 0.1mm layer height, or slower than about 50mm/s. But, there again, sometimes there are good reasons to. The ultimate challenge is to find the settings that give you a print whose quality meets your needs without it taking any longer to print than it really needs to.
In general, the difference that settings makes should be in making a reasonably ok print, into a really good print. That's the intuition that you need to develop as you get more experienced. Rather than randomly trying different settings, what might be a better approach for you would be to post some examples of things that you've tried to print, and the results that you got. That way we can help you calibrate your expectations first, and then your machine :-) Chances are that the folks here can help to identify a) any technical problems that might be spoiling your results, and/or b) suggestions as to how to tweak your settings or tune your printer to get better results. And then you will need to begin a process of careful experimentation as you begin to learn how the different parameters - mostly speed, temperature and layer height - affect the outcome of each print. I highly recommend taking lots of pictures, and keeping a note book of the different things that you are trying. It's a great way to begin to identify a middle ground of 'not bad quality, and not unbearably slow' that you can then begin to refine from.
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