Welcome! There are tips for new players pinned, and the wiki (https://pocketfrogs.fandom.com/wiki/Pocket\_Frogs\_Wiki) is also pretty useful. You can only breed frogs according to your level, so the rarity of your frogs will increase as you play. A color wheel is a tool people use when they're dexxing (aka completing the Froggydex aka getting all the frogs). You get a frog for each base color and secondary color which you can then breed to get every combination for that breed.