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Need a proper document, still looking for one. Until then, post evolution paths and costs please.

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According to http://www.polygon.com/pokemon-go/2016/7/16/12205402/pokemon-go-eevee-evolution You can decide on the path the Eevee goes on, by renaming it prior to evolution.

Thus, according to Reddit, if you name your Eevee Rainer, you’ll get Rainer’s Eeveelution, Vaporeon. There are several screenshots and even video that seem to confirm this method, but players should keep in mind that there’s a 33.3 percent chance of randomly getting the character you want, which isn’t huge, but isn’t tiny either.

Research it first, don't take my word for it as I haven't tried it yet. But in theory:
Pyro = Flareon
Sparky = Jolteon
Rainer =Vaporean

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Here's a quick list of each element type, and what opposing types of Pokémon are best-suited to take them down:

Normal: Fighting
Fire: Water, Ground, Rock
Water: Electric, Grass
Electric: Ground
Grass: Fire, Ice, Poison, Flying, Bug
Ice: Fire, Fighting, Rock, Steel
Fighting: Flying, Psychic, Fairy
Poison: Ground, Psychic
Ground: Water, Grass, Ice
Flying: Electric, Ice, Rock
Psychic: Bug, Ghost
Bug: Fire, Flying, Rock
Rock: Water, Grass, Fighting, Ground, Steel
Ghost: Ghost
Dragon: Ice, Dragon, Fairy
Steel: Fire, Fighting, Ground
Fairy: Poison, Steel

Found at http://www.imore.com/how-to-win-gym-battles-pokemon-go

Pidgey -> 12 Candy -> Pidgeotto -> 50 Candy -> Pidgeot

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Footprints:

From sources:
1 footprint = 40 meters (130 feet)
2 footprints = 60 meters (200 feet)
3 footprints = 90 meters (300 feet)

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