Basically there are two points here.
If you bought it legally, you can dispose of it legally. So in theory you can sell anything you own.
BUT
There are constraints on some items. The easiest to understand would be a handgun. You can, in special circumstances, buy a handgun in Canada. But you can't sell it to some random guy at your next garage sale. That becomes a public safety issue.
Then "branding" comes in here. Some brands do not want their items sold except by their chosen retailers. They have joined with eBay to monitor the sale of their products here. Some are very tense about this, others more relaxed.
Generally, the first rule still holds. You should have no problem selling coins- which belong to the owner not the Mint that produced them. Nor with Pokemon. If you bought it, it is yours.
However, if the product is often counterfieted , like designer purses, cosmetics and perfumes, the brand will monitor sales much more closely, to protect their reputation.
As you get known for selling a product, the brand will relax even more, because they can see that you are treating their reputation well. Which is good for you as well as them,eh?
As to the numbers- if the items you plan to sell will sell too low to make it worth your while, you may be best either to sell them in lots rather than one at a time or to sell them to a card shop. Yes the dollars you get will be less- the shopowner will buy at wholesale- but you will be paid promptly. (The minimum wage in Ontario is 17 cents a minute. Think about that.)
In my opinion, the lowest price you should list anything at is $10.
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