become his friend!!
boys love when you'll have conversation and act friendly, just dont move to quickly, because, i will admit, boys ages 10-14 are pretty immature and are a bit scared of a relationship.
get to know him before you try anything, and if he shows signs, (looking at you then looking away, playful teasing, wanting to be close to you, jealousy, etc.) then you could try and flirt.
thats my advice!!!
-Joel/Worm