Pokemon-go – How much stardust is needed to power up a pokemon

Teams

Once you hit level 5 and try to enter a Gym, you can choose from three teams: Team Valor (Red), Team Mystic (Blue) and Team Instinct (Yellow). Each team may be tied to a respective Kanto legendary bird Pokémon (e.g. Instinct is yellow, and has the icon of Zapdos).

_{(source: pokecommunity.com)}

Note that the official website states that you ‘cannot change Teams at this time’. Maybe this restriction will be removed later, but make sure you’ve talked to your friends which you should choose before you jump on a team!

Source

Like Samthere said, you can delay indefinitely, however id recommend keeping one Pokemon high to take gyms with. Don't power it up more than you have to but keep it high enough to get at least a few gyms. The extra star dust and coins you get should be worth the candies and stardust you spend to keep just one Pokemon high. I usually get rid of anything with a CP meter under 90%. It's probably good to set a goal like level 25, otherwise you probably will delay it indefinitely. Lastly, go ahead and evolve any Ratatas and Spearows (or other really common ones in your area) you can for the experience. Their evolved forms max out pretty low so they aren't really viable later, otherwise leveling will get really slow unless you are hatching eggs left and right.