I am in a similar situation this coming year and I did some research you might find helpful.
CCAA has no letter of intent or scholarship guidelines and leaves that to the ACAC. ACAC has no letter of intent policy and leaves that to the individual school. ACAC LOI signees are entering an agreement between themselves and the school (or coach or athletic director as the case may be) and it isn't binding from one school to another within the ACAC. These LOI forms can include inducements of scholarship money. This athletic award is generally the Jimmie Condon and its worth $900 per semester. Only permanent Alberta residents are eligible for the Jimmie Condon and this amount can also be topped up to the full tuition and required enrolment fees. ACAC member schools can only provide financial aid, specifically athletic scholarships, to student-athletes to participate in intercollegiate athletics in a financial form, and can not exceed the student-athletes’ tuition and required enrolment fees. This does not include other scholarship funds like the Rutherford or school specific academic awards.
Ask your high school or club coach if they are familiar with the program you're considering and if they know the coach, his history and how he runs his program. That might be your best bet in determining what they're telling you can be trusted. They could entice you with promises they have no intention of keeping if it doesn't work out for them. Many athletes sign LOIs and feel like they are committed to the school and the school to them. That is not reality. They still have to make the team as a regular and only 12 Jimmie Condon scholarships are available per member institution. Many ACAC programs go into the year with open tryouts and bring in more recruits than spots, as an insurance, which means you could sign an LOI, register at the school, move to the furthest most remote areas of the province only to not make the team and be stuck at a small school in northern alberta or worse. There are no iron clad guarantees of making a team or receiving a scholarship until it actually happens. Do your research and tread carefully.