As your husband is a Canadian citizen, he does not need to travel with you when you land in Canada. However, given that you are gaining PR due to spousal sponsorship it could look very weird to the border officer if your husband is not with you.
Your landing in Canada has no affect on your husband’s residency though, presumably, as part of the sponsorship application your husband pledged to move back to Canada with you. Regardless, your immigration status and your husband’s tax status are not connected.
Yes, you can live outside of Canada with your Canadian citizen husband and not violate the residence requirement.
You will lose your visitor status when you become a PR. When you land as a permanent resident, you will complete the PR Card application. The PR Card will not be issued for six weeks. If you leave Canada without your PR Card, you have to have it sent to you.
Please note that your intentions, though they do not violate the letter of the law, appear to violate the spirit of the law. Sponsorship is for people intending to live in Canada.