Hello Shane, welcome to the forum!
Here is a thread that discusses and compares various pheromones and their general uses.
There are a million ways to go with these, depending on how you mix and match and layer. It takes a little base knowledge of each one, and a testing of each one singly to see how they react with your own chemistry and to find your best dosage or “sweet spot.”
When it comes to side effects, some have experienced a ‘rush’ when they apply pheros the first couple of times, and a bit of a ‘crash’ afterward. Your brain needs a little time to adjust to the new pheromone signature you’re bearing, and this only takes a few applications usually.
What are your own goals with pheros? What would you like them to do for you, in other words.