These are tough questions actually..... because if you ask different people you'll get different answers.... it IS a matter of opinion after all !!!
Here's my take on things for what it's worth....... as a growing young man i would say the nutrient you need most of is protein which you'll get plenty of on this diet......also during and after your surgeries your immune system will need to be in good shape, so plenty of vitamins from fruit and veggies.
If you want to comprimise a little to start with to see how it suits you , then you could always include sweet potatoes and brown rice to give you some carbs (though no bread or pasta as these are processed ).
Here's a typical days diet for me which will give you some idea.....
Breakfast....... grilled bacon, poached egg and wilted spinach
Lunch..... baked sweet potato with tuna/mayo and side salad/seeds (make my own mayo)
Dinner...... grilled turkey breast with roasted veggies and collard greens
Snacks..... nuts/seeds/apple/plum/grapes/nectarine
Drinks....... fruit juice/water/rooibosh tea
Let us know how you're getting on

Nicki