The diet guides are very useful, but it can get confusing.
My 3 get 2 handfuls of pellets per day between 2 bowls, lots and lots of hay and about a pasta bowl full of assorted veggies spread throughout the day.
I give them a romaine lettuce leaf or a chicory leaf each at breakfast, something in the middle of the day when they start shouting at me - a small pack of dill for example and the rest of their allowance in the late afternoon after playtime.
The main thing is not to overdo the stuff that's too high in calcium or sugars but feed those as occasional treats.
Fortunately guinea pigs are basically fur covered appetites and will tuck into pretty much everything
Welcome to the forum and I hope we will get to see pictures of your piggies soon.