email now or wait to talk in person?

I work at a small architecture office in Canada, small and quiet, I got here not through typical interviews but as a referral, they gave me the chance to work, offered a kind of low starting wage and not a very disclosed contract. No info about vacations, benefits etc, just that there would be a 6 months review. I took the job because I know the boss was taking a change on me (not really knowing me or interviewing me) and I was desperate for work.

8 Months have gone by, proved myself pretty well and have been asking for that review with the boss so I cant pitch him about increasing the hourly rate, but he is always in meetings, traveling or pretty busy when he is in the office, I do not want to be aggressive and just storm into his office to discuss, and I don't feel comfy asking my senior coworkers because they are way too quiet and don't seem to fraternalize much.

Should I just shoot him a well redacted email requesting a raise and more information about my future at the firm? Or would that be considered unprofessional and an in-person discussion would be more adequate?

TLDR; I want a raise, but my boss is always out or busy when he is in to discuss, should I discuss over email or wait until I can take him face to face?