I have done a lot of painting in the past but lately I mostly use watercolor with very saturated, colorful abstract designs that hint at landscapes and floral but are not realistic in any traditional sense. I have used acrylic but I go back to watercolor because I love the "flowing" method of painting so much. It does take patience to let layers dry before being able to add more depth. I also like that I can take a small watercolor "kit" with me on the go.
Daniel Smith used to have some good tutorials but there are wonderful books too - it just depends on your interest, realism vs. abstract for example.
I took a number of classes and did everything from life drawing to multi-media to plein air landscape. I even participated in a few shows.
One of the first classes I took was collage and watercolor. We used varoius art papers (rice paper with embedded natural leaves, fibers, etc.). We used a transparent acrylic medium for glue. I loved that class and it really got me going.