My printer came with a USB lead to connect to the printer but no micro SD card although a micro SD slot was provided on the printer mother board.
Like you I have to use a card to transfer my files. There are some good and bad points.
You can switch off you computer and the printer keeps going. Similarly if something goes wrong with the printer it does not upset the computer.
Obviously apart from the card itself you also need a micro SD to USB reader for your computer.
Prints can take hours so if you are using a lead make sure you computer does not time out. A best the printer will just stop at worst the print will be scrap.
Just a word of warning, beware of static. You can build up static walking from one to the other. It pays to discharge yourself by touching some metal on the printer before you insert the micro SD card. If you don't there is a risk that the discharge will occur over the card and that can upset the data on it. Been there!