What steps should I take to help a Thai citizen apply for a Canadian visa?

You should go on thai visa forum and search or ask. Tons of posts there.

Is it pretty easy for a Thai national to visit Canada? More easy than the USA?

Gord I brought my girlfriend into Canada last November and I was surprised that it went easy she used someone there in Bangkok they sent me a list of documents for me to send passport, house particulars, letter of responsibility, employment verification they charged 3000b once they set everything up she went for the interview and I think she was approved in 5 days. The process took maybe two months. She had been to Germany twice to visit her sister so she had a history of abiding by previous Visa's which is important. But she got a 6 month visitor visa.

Canadian visa applications, same as UK and Australia are managed by VFS global

You will be required to show proof that you can support the person. You will have to provide health insurance for the person. They will need a return flight ticket. Purchase a refundable ticket in case they get rejected. Valid reasons why they will return to Thailand. Eg job, family, owning property.

Canada immigration can be very difficult to deal with. No one there has any common sense. I’m speaking from experience. My wife’s mother was denied. She was 65 had all her family except one daughter in Philippines. Owned property. She / we wanted her to come see her newborn granddaughter. She was denied a visa. They felt she wasn’t going to return home. Yet they let in terrorists and refugees by the hundreds of thousands. So good luck. Your friend would be better off taking a boat and claiming refugee status.

You really need "Canadian visa advice" for that. I'd suggest your embassy website as a good start.