Start by studying the basics such as meditation, centering, grounding, energy manipulation and visualization.
These can be searched for in the search bar on the forums page.
The basics take time so it could be months or even a year or two before you cast your first spell.
Also research into what magic truly is and how it truly works so you know that you cannot change your dna in anyway or grow wings or teleport or create fire balls. If it seems illogical than it probably is.