I am not surprised that you are having trouble getting into the new paint. When I first started, my new watercolors sat on the table for over a month before I opened them.
Good paint with a heavy pigment load are essential to good painting. Craft paints are thin and opaque. They are designed to make smooth flat strokes and cover anything below. They generally use pigments that fade in time so the paintings are not archival.
There are a number of threads that have tutorials on acrylics. Perhaps someone can post them, I am not familiar enough to suggest any.
Painting is about color mixing. It takes a lot of effort to learn it but results are worth the trouble. As you learn, remember that all painters follow the same path.
See my website www.dummannart.com