I am glad you don't have kids...that makes it much easier, not to mention that you can get your spouse completely out of your life forever if you choose. If you had kids, you would be tied to your ex for a long, long time.
You may not have to pay spousal support. If you don't, the more time that goes by, the better your chances of never having to pay it at all. The longer your spouse goes without spousal support, the harder it is for your ex to justify needing it.
NeoMadman's advice is sound. Get yourself financially separated from your ex as soon as possible. Especially on any active credit cards. Make sure your name is off them after you separate; the companies cannot come after you then.
Same with joint bank accounts. Legally, your ex can clean out the account if she is on the account. Also, your ex can remove you without your consent. Most people don't know you can do that in Ontario.