As a third year caster, how long have you been studying. If just 3 years, why don't you try learning a bit more before attempting to take on students in the art of spell casting.
The reason for my suggestion is that spell casting is such a broad topic/category in magick that there is so much to learn before being considered actually knowledgeable.
~ 1 year of being a complete beginner.
~ 2 years, you're getting the hang of intermediate spells.
~ 3 years you're creating your own spells (simple, not too complex) and you're learning the basis of the more advanced functions, techniques and are a beginner to multi-religious values of spell casting.
This is just a generalization, you may be much further but I still bid you to wait and study more before taking another person's learning into your hands.