Where do I start to end this?

1- You ought to claim Joint Custody and Joint Guardianship under a “Master Joyce Model of Guardianship” whereby you must consult with each other on all matters relating to the child’s health welfare and education but where in the absence of agreement you (as the primary care giver) would have the final decision making authority.
2 - You can either commence a legal proceeding by way of filing in the Supreme Court a Notice of Family Claim, or you can simply send an email confirming thae date on which the 2 of you separated and requesting that the issues flowing from your separation be resolved by agreement (Property & Debt division, Spousal and Child Support etc).
3 - You would need to commence an Action in the Supreme Court of BC by filing and serving him with a Notice of Family Claim following which you would file a Notice of Application & supporting Affidavit for Interim Spousal Support, or you could file an Application to Obtain an Order (for spousal support) in Provincial Court, or you could start with a demand letter requesting that he agree to pay you interim spousal support in accordance with the Spousal Support Guidelines.
4 - You can leave the home whenever you wish. You can take the child with you but he can likewise refuse to return the child to you following his next visit as there is no existing order or agreement. Ideally you would negotiate a parenting time agreement before you move out so that there is no dispute about when each parent has the child in their care.