Hi TinyBird,
The important thing to remember when working with any kind of paint is that you need some kind of systematic approach to rendering in order to produce a predictably good result. Just slapping paint to board will almost never result in high quality results. Another thing I would highly advise against is buying cheap paints. Even if you are using them to learn; higher quality pigments just respond differently, more predictably and in most cases more satisfyingly than cheap or 'student grade' paints.
There are many approaches to acrylic painting and I'm sure everybody has their own method, but if you have any technique-specific questions I would be happy to share. Here is a pdf book from Liquitex's website.
http://www.liquitex.com/acrylicbook/
I have used their paints for about 18 years and found them to be of consistently good quality. The book has a lot of stuff geared towards selling their products, but it also has a lot of solid technical advice about acrylic paints in general, mediums and their uses, techniques, etc. Hope this helps.
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