Looking at how much your items vary, you should purchase both a smaller kitchen scale (for things like hockey cards), and a larger scale meant for heavy packages (for things like the large battery).
Because your items vary so much in size, you really need to use calculated shipping. Someone from a rural town in a province on the other side of the country could buy your item and it will cost you $150 to ship it instead of the $50 you charged.
You should print your labels directly on eBay. Not only will you get better rates, but it will minimize the possibility of a user error, like making a mistake with the address. Additionally, eBay has tracked Expedited shipping for smaller items like hockey cards (200g or less) for only about $8-$10.
I would take a bit of time to read through the documentation on Canada Post's website as far as things like size and weight limits go for each type of shipping. Especially if you are going to ship to the USA with Tracked Packet. You don't want to charge someone for Tracked Packed, and then find out it's too big.
Another thing you could do, go to a Canada Post outlet and purchase one of each size of their flat rate boxes. They range in price from $17-$33 (XL, S, M, L). If items fit in flat rate boxes, you could charge a flat rate based on the size of box they fit inside. If you plan to actively sell, it is good to keep one of each size on hand at all times.
A word of caution, your account is going to attract a lot of scammers. In my experience, eBay is a safe platfrom for experienced sellers, but scammers do sometimes look for new sellers who they assume do have not read eBay's terms of service or buyer/seller protection policies. Because you only have 1 feedback rating, selling something like a $500 camera is a very risky proposition.
I would read through all eBay help pages, but the two below are very important:
https://www.ebay.ca/help/policies/selling-policies/seller-protections?id=4345
https://www.ebay.ca/help/selling/managing-returns-refunds/handle-return-request-seller?id=4115
Two things to remember:
1 - Always ship to the address on the invoice page. If the buyer tells you to ship to a different address, no matter what their reason is (it's a gift, I made a mistake, etc), contact eBay to cancel the order. That is a scam. It doesn't matter how truthful the reason is. Contact eBay's customer service to cancel, and invite the buyer to purchase the item again with the correct address. (Spoiler, they won't.)
2 - If a buyer opens a return, you have to resolve it with a return label before the deadline. You are going to get someone who buys an expensive item and plays a game of chicken with you, where they open a return and hope you have no idea how to handle it as a new seller. If you do not provide a label, they will get a refund and get to keep the item. If you provide a label, they may not go through with the return and you can cancel the label if they don't. If they return the item, at least you still have the item...
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