Planet 1: Elysium has a slightly thinner atmosphere compared to Earth, with 20% oxygen, allowing for easy breathing. The gravity is 0.9 times that of Earth, giving a lighter feel. The landscape is rich in lush forests and vast oceans, with ample fresh water sources. It is home to unique plant and animal life, including bioluminescent trees and floating jellyfish-like creatures.  There are animals similar to turtles, birds, porcupines and bunnies. However, periodic strong electrical storms pose a significant threat to living on Elysium.

Planet 3: Terranova atmosphere consists of 15% oxygen, which requires the adaptation of respiratory systems to extract enough oxygen for humans. Despite this, breathable oxygen is present. The gravity is double that of Earth, ensuring a heavy feel. Terranova is characterized by immense oceans covering 70% of its surface, with stunning coral reefs and an abundance of freshwater lakes. Its plant and animal life are predominantly aquatic species, including seaweed forests and an array of marine creatures. However, the planet's frequent tsunamis make it challenging to establish stable settlements.

Make sure you go through each one to figure out which one you like!  The more you tell us, the better you'll do.

Planet 2: Atlantis has a peculiar atmosphere with 35% oxygen, providing an extra boost of energy for humans. The gravity on Atlantis is half as strong as Earth's, resulting in a lighter environment. This results in refractive rainbows everywhere there is light.  The planet features a rugged landscape with active volcanoes, lava rivers, and extensive underground cave systems. Despite the fiery conditions, fresh water is abundant in Atlantis, offering resources for survival. The plant and animal life have adapted to intense heat, including heat-resistant ferns and fire-breathing lizard-like creatures.  There are also unicorns, lava mermaids and phoenixes.  It has a moon!

Nevertheless, volcanic eruptions pose serious dangers to any settlement on Atlantis.

Planet 4: Luminara possesses a unique atmosphere with 18% oxygen, requiring acclimatization by human inhabitants but still allowing for comfortable breathing. The gravity on Luminara is two times stronger than Earth's, making it a physically demanding place. The planet's landscape is characterized by vast swamps, towering cliffs, and dense jungles, offering a diverse range of ecosystems and freshwater sources. Luminara is home to incredible flora and fauna, such as giant floating plants and winged creatures. However, powerful and unpredictable windstorms make living on Luminara perilous.

This is a big task.  You can do it.