first of all it is not the smell of pheromones that effects people its the subconscious pheromones that travel to the brain… u might be confused with how a persons smell can affect another opinion of them… that is pretty different.
its most likely a good idea to start of with single products… im sure u r eager to get results right away… but just take ur time. pick a product, and follow this schedule. this way u can find ur sweet spot. then u can find out wat works best for u.
as for the location, i depends on the effect u r looking for. look in some of the stickies in the mens section for this. pheromones work best around people that u do not know (first impression)
hope this helps 
bond
*BTW: y is this in the women’s section?