Shipping? See my questions about shipping... I have a few :)

Ok,, hello and thanks for whatever you may have to help.

I'm planning on offering product on certain sites. I see a lot of questions here about the process of "drop shipping" and where to find products and all that but, not anything about the "shipping" process. (If you're not drop shipping)

Here's actually my deal: I need to have my orders that come in have tracking numbers.
However, when I get the orders they will be in bulk,,, could be any amount from 1 - 100+.

The advertising platform that I plan to use requires advertisers to have orders with tracking numbers back to them rapidly (within 48 hours) to give to their customers.

I'm sure there has to be a way to "bulk" order shipping with USPS or UPS or others(?). I don't know anything about it (I can do individuals) and that's why I'm here asking. Yes, I have the info on the product weight and all that but, I'm ready to hit the launch button on my product offer but I MUST be able to ship a lot fast. There's gotta be a better way than manually typing in each order and doing each order one at a time. (what if you get thousands of orders a day?)

Does Shopify or any of the other ( I plan to use Shopify) ecommerce platforms offer any type of linking to, or plugins that have some sort of auto shipping payment? Or anything to do with the shipping process? Any type of linking from USPS, or UPS to my site so each order gets shipping and tracking immediately?

Do you guys get what I'm saying? My ad platform sends me orders in bulk. I need to take those orders, how ever many, and get shipping and tracking in 2 days.

So my question here is how do I do bulk order (100-1000 orders) shipping and tracking without doing it all manually?

Thanks,

Robert C.