Magic Forums

How can i effectively practice energy magic? I often find myself without materials and would like to practice the spells i find but do not have the listed ingredients. I already practice energy magick but would like to know if i am doing it correctly and maybe some tips to make my visualization more effective.
What i do is basically imagine the entire spell in my head. All the ingredients, the chants (sometimes i say those out loud) etc. I always imagine "feeling" the spell. Feeling the results that i wish for it to bring me. Is this correct?
Also, is it possible to visualize my spells with my eyes open or should they be closed? Thanks.