To become a member of the Conservative Party of Canada you must:• Be a Canadian citizen or permanent resident of Canada
• Be at least 14 years of age
To purchase a party membership ($10, as I recall), call 1-866-808-8407
To be eligible to vote in a constituency candidate selection process, you must be able to prove residency in the constituency (a utility bill or driver's permit) and have been a party member for 21 days - so it's best to buy that membership ASAP if you're unsure when to expect a constituency race - it's good for a year.
To contact the Calgary West constituency directly (about when to expect a nomination meeting), e-mail them at firstname.lastname@example.org or get more information at calgarywest.com (they haven't updated the site since the judge's ruling).