Consider yourself as though you were a child once again. You need to learn how to walk, talk, see taste, touch, feel, smell and think on your own. Maybe some positive encouragement every once in awhile but the biggest factor is trail and error. It takes time but patients and practice is all it really takes.
As far as suggestions. Learn to associate colors you see with sounds. If you can see color and hear it your desires will start to form it into recognizable shapes and figures. Eventaully your astral perception will mirror your regular life (minus all the wild flowing colors and trippy visuals). Once you can see colors and hear sounds then you can try to expierence the shapes/figures that are formed. This is how you learn to touch. Then try to taste it, smell it even share a thought with it without actually speaking. Since sight and sound are the two biggest sense people are geared for start with those and the rest will flow.
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