Which course (s) would I need to take to do dermal fillers/botox?

Whats your specialty. What is your specialty? Procedures such as neurotoxins and dermal fillers are not properly learned in a weekend course. Board certified dermatologists and plastic surgeons among a few other specialties are best equipped to perform these procedures, including advanced techniques.
Hard to Say. Everybody is different and needs are different. Speak with your doctor about what is right for you depending on what you are trying to accomplish.
Botox. Botox and fillers are serious prescriptive drugs and should only be administered by doctors. If you can;t handle the complications, you shouldn't do the procedure.