Firstly, welcome to the site.
I'd recommend you start of with what we call 'the basics' before you to progress into casting spells. The usual basics are meditation, visualization, energy work, chakra work, correspondences (moon phases, colours, herbs, etc), and to me, understanding magic.
There are many people on the site who are adept in healing, i'm sure you'll stumble into a few. Feel free to ask them for tips and pointers.
You'll find many people on this site will be on the same track as you, with the same form of mind.