The 'Age' system works like this: Foal, FIlly/Colt, Mare/Stallion
Occupation wouldn't be Homeless as that isn't a job or profession. The nearest equivalent to such would be Jobless, though that has the problem of not having any income.
Your character may have a crush on Rainbow Dash, but one of the rules is that no OC can have a relationship with any canon character. That goes with the idea that any such relationship needs to be earned or developed during roleplay not just starting out. This also effects the bit involving Derpy, I'm sorry to say.
What of how he gained his cutiemark?
The details involving the changelings effects a few things, such as your pony's age as the attack on Canterlot was a more recent event. Which is why I put down that his age was colt not stallion, as it would make him fairly young in age. More like an older teenager at most. Also King of the Void sin't really a name I could see a changeling happen, especially the royal title of 'king' since there are only hive queens since the race has a fair bit of connection to insects.
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