Hi and welcome to Talk Parrots, the diet you have planned out sounds good. When will you be getting your bird? Will it be from a breeder or a pet store?
I am a firm believer that seeds and pellets should always be offered in separate dishes and at separate times as birds are seed eaters and depend on that as the main staple of their diet, not all birds will take to pellets especially if they were not raised on them by the breeder so you should offer the pellets in a small feeder cup and remove the bird seed from the cage for a couple of hours. By measuring a small amount of pellets in the feeder cup it will show you if your bird is actually eating the pellets once you remove the cup and take a look at what's in the cup, once you know the bird is eating them then you can add a little more of the pellets to top up its daily diet.
Tiels are big on veggies so offer them greens daily or as often as you can as this is great for your birds, a lot of people take some of the birds seeds and sprout them to offer this as the birds tend to enjoy it this way and its very healthy for them. as well.
The only thing I avoid with a tiel diet is sunflower seeds, they are high in fat that a little bird shouldn't be eating daily. I've had tiels who picked through their seeds and only ate the sunny seeds one of those tiels had a heart attack and the avian told me she should have been curbed from the sunflower seeds all together.
All birds are different in their likes and dislikes with food, I've had birds ignore fresh lettuce or dandelion greens for months and then out of the blue they dig into this veggie like mad. So there is no set rule with feeding your bird, you just have to find out what your bird likes and then experiment.
Make sure to know what's safe to give your bird and what's dangerous or toxic/poisonous.
There is a thread here to show you how to sprout your birds seeds too!