>>50745256I'm not selling that many cards, I've only got a couple hundred up for sale.
I mail them out with ebay standard envelope. The label costs 53 cents and it includes """tracking""" and included insurance so you are protected if a buyer tries to scam you. I also include pictures of the cards so they know exactly what they're getting.
However, the included insurance is only up to $20, so if your card is valued higher than that, I would ship it first class in a bubble mailer and a top loader.
For cheaper cards I just put them in a penny sleeve, put a piece of painter's tape on the top so it doesn't slide out, and then fold them in a piece of cardboard.
It has to be thin cardboard or else the post office will return the envelope to you for being too thick. Like the floppy pieces of cardboard that sometimes lines the bottom of small boxes. You could put them in a toploader if you want but that's eating into your profits.
I never use condition descriptors like "mint" or "near mint" and so on because that just opens you up to arguing about condition with people. If anyone asks I just tell them I am not a professional grader and refer them to the pictures to evaluate the condition for themselves.
If you have a shitton of cards, TCGplayer is a site where there isn't an expectation of pictures being included. So you could list your shit rapidly. The problem is that TCGplayer is bottom of the barrel prices. It's up to you how much effort you want to put in.
It might be most efficient to sell your common stuff on tcgplayer and your expensive stuff on ebay.