So I am a freelance model, so how and when does one do taxes? And how since I will be doing paid work most of this year and hoping to make over $600.00 this year.

You are treated as a self employed person.

Income is declared on your tax return.
Taxes are usually paid in quarterly installments based on estimated income. (there may be a cutoff threshold)
Same with HST which is collectible if over a threshold amount.  (monthly)

Deductions from income include clothes that can't be worn outside of modeling and related expenses that are directly modeling related. Rules are strict. Might not be worth attempting to make certain claims at all.

Keep detailed records af all income and expenses!!!

see
Canada Revenue Agency
http://www.cra-arc.gc.ca/menu-eng.html

A Google search can sometimes be easier than navigating the above