Use the app - Its a great way to keep track. It tells you what to do every workout.

ideally, you just keep on alternating regardless of what day it is in a week. that way you give the specific muscle groups involved in each lift a consistent pattern of rest periods before you need to use them again in exactly the same way that you used them last time.

but i'm a big believer that 'functional' means more than just being able to hoist a toddler because deadlifting is a natural movement blah blah. it also means 'functional within the total frame of your life.' so i don't think it's the end of the world if, for instance, the only monday timeslot you have in the gym is the same timeslot as that guy who should just stick a card with his name on it on the only rack in the place.

my policy is: so long as i do all of the prescribed lifts within a given week, then i'm good. i try to space them out, of course . . . but if it doesn't happen, it doesn't happen.