I am 14 and have about $400 towards a new bike I am 5'4" and love to mountain bike.
What type of bike should I get? If you love to mountain bike get a mountain bike.
Where should I get it? Local Bike Shop
is ebay good? Not for somebody that has no clue as to what they want.
Should I get full suspension or hard tail? You're not going to get much full suspension for $400.00 unless you go to Walmart.
Is a 19.5" fram size good? Not if you're only 5'4" tall.