And, once you have a uniform, you'll be told what colour it is expected to be, in accordance with the issued head dress other members wear. But that's for the future. For example, armoured units will wear black, artillery and signals wear a very dark blue, MP's red, airborne maroon, etc. This tradition extends to the RCMP, where the service order expectation is navy blue, and the review order light brown to match the stetson non-Sikh members wear.
In my unit, new recruits are expected to wear dress casual on their first parade night, and are issued coveralls to protect their personal clothing until the Army can issue a uniform.
Good luck, have fun, wear hearing protection. Tinnitus sucks.