I do this with Kickstart(Well, most Mtn Dew products), but Kickstart is their energy drink. Wide variety of flavors, and they taste better than most other energy drinks, in my opinion.
A 16 fl oz can is 80 calories and packed with 92mg of caffeine, while their smaller 12 fl oz cans are 60 calories with 68mg of caffeine.
Not sure what you mean by tips, or specifically what you're worried over(Overdose? Withdrawal?) but you can actually consume a lot(400mg worth of caffeine in a day), yet it can stay in your system for a while. I can not remember how long, but I do remember reading that it was a significant enough amount of time.
Withdrawal depends. For me, I can stop caffeine whenever and all I ever notice is a mild headache, which is manageable, while it's possible to get a severe headache, feel almost hungover, sluggish and irritable for others. I recall a time when I was about 13 or 14, and my mom's boyfriend at the time had not had his morning coffee(It had to be QuikTrip coffee), and the guy nearly got us in a wreck pulling a ballsy stunt to get into the parking lot. I never experienced a strong pull like this, unlike with cigarettes where it was very, I need this RIGHT FUCKING now.
I do not believe I have ever overdosed on caffeine, so that's something you'd have to look into. It is possible, but the mortality rate is low. Very low.
Also adding that caffeine has health benefits, so it's not bad to have it, it's just gross if you drink an insane amount of it, like me. I'm pretty sure my bloodstream flows with pure caffeinated goodness at this point, which is probably counterproductive but I feel great, so no fucks to give.