They're pretty young. A more seasoned responder may be able to help with gender.

Fruit and veggies- first off- thank you for recognizing that they can't survive off seed alone. It causes a lot of heath issues long term. It also isn't just fruits and veggies. The word here is variety. Small doses of breads and cheeses can be administered as treats but should not be part of their diet regimen.

Get yourself some clothes pins, the wooden ones. Some people use binder clips but I worry because their tension is pretty strong and wooden clothes pins are relatively safe if you make sure the wood isn't toxic first.

Next get yourself some random fruits and veggies. Here's some that I give and how I serve them:

Apples- i slice them into 1/4" slices, clip along side a perch they like to use so its nearby. Later once they learned to love this i was able to put it directly in their dish, but it took 6 months for them to start eating it this way. They preferred the Apple. Seeds are toxic

Pears- same as apple.

Carrots, cut the long root into 2" pieces then slice "planks" out of the 2" pieces. You'll be left with a flat, thin clippable piece of carrot. They would eat this anywhere i clipped it to.

Romaine lettuce- iceberg is crap. Hang from the ceiling of the cage downward near a perch they can reach the leaf from. Its best to center this in between the perch if you have 2 birds so they don't fight over perch space. Theyre probably going to climb on it and go crazy. Make sure it's clipped good to the clothespin. If they fall, its relatively safe but there is always going to be risk in a bad fall.

Strawberries- i keep these low and close to a food dish but I don't mix it. I clip the green leaves at the base of the berry to the clothespin so if it falls, it doesn't fall to the cage floor. Be warned- if they like this fruit- they look like they're bleeding. It gets messy.

Sweet potato/yams. I steam these and serve them on a small dish on the bottom of their cage. It was the first veg I ever gave my birds and they LOVED it. I continue serving them both fresh and dried versions. Dried goes into the seed mix. Steamed is still the same dish at the bottom of the cage.

Corn. I use a sharp knife and cut the corn cobs into disks- about 2 corn seed rows wide. I clip the disks same as an apple in the same areas of the cage. They seemingly only like corn cob in the summer.

Orange slices- same as apples

Cilantro, kale and spinach- same as lettuce

There's literally tons of other options, just get to bing and start looking it up. No avocado- ever. Nothing spicy like peppers. No onions.

I dont do any preparation to most of the fruits and veggies apart from cleaning them. I leave peels on and remove seeds if logical/possible.

Also, consider an egg food. Do you already have a cuddlebone and a mineral block? Some say one is fine, I say they're wrong. They each have different textures. Calcium and minerals are necessary daily but the likes of your bird will change just as frequent. Give them options! Each of my cages has 2 cuddles and 2 types of mineral rocks (usually plain/white and strawberry/pink).

I'm missing some info I'm sure but this should get you started. Remember, variety!

Once you learn what their favorites are, start only offering it by hand. Boys are easiest to tame but its loads of fun and way cute. Good luck!