How does not having Manifests available on my account effect me?
If you are concerned because you are a small business or a counter client with canada post and you aren't able to print and or transmit manifests this won't really effect you.
Manifests are for when you have a lot of orders and labels that need picked up and are on a commercial account this allows for the pick up person to scan one bar code (manifest) that has all the labels and orders that are in that manifest instead of having to scan each label individually.
You can still print labels with a counter account (pay by CC) you just can't do manifests. In order to be able to have a commercial account canada post requires you to ship 750+ orders a year.