Coming from a person very experienced with Amphetamines/ Adderall I will tell you this.
It's your first time with them, Id suggest taking 1 XR capsule as is. Put it on your tongue and swallow it. Eat a meal with it because I am telling you as a first timer your not going to eat once they kick in. Food does not affect the XR's so eat while you can. It's just gonna take a little longer for the Addy to take effect.
I would suggest chilling at home with a friend while you take it so you have someone to drive crazy with all your talking that you'll probably end up doing. If you've got a videogame console then you have a lot of fun ahead of you.
I have a script for 30mg XR's every morning and I'm a heavy Speed user with a tolerance yet these 30mg XR's still wake me right up every morning. Once they start kicking in I notice it right away just by the way I start typing and how my foot just keeps moving.
XR will release half the medication at once and the other half 4 - 5 hours later and as a new user 10mg's will have you going. Your gonna be feeling the drug for 10 - 15 hours. You most likely will feel like shit on the comedown as your new but there are ways around it.
Take a multivitamin to replenish yourself and stay hydrated. Personally I don't feel any negative effects from drugs in general and don't get all these horrible sounding after effects from Amphetamine comedowns that most people seem to get but they are very possible so just be smart about it.
By the way, music is a must. It sounds absolutely amazing. I'm a metal head and listening to music is unbelievable, you pay attention to every note played and the timing of the music.
Hope this helped you or anyone else looking for some answers.
PS: I'm currently on my Adderall and it's quiet apparent by the length of my response here.
Be safe