Do you have any kind of SD card adapter for it? It a modern machine that can write floppy disks? Does the SE have an ethernet card?
You can move files using a USB floppy drive, but you have the be careful with files - old macs had a thing called a resource fork (have a look on Wikipedi, good background info) that other computers don't understand. Putting most old Mac files on a Windows hard disk damages them unless... Wrapped inside an appropriate format to protect them, such as .bin, .hqx or .sit. You can't unwrap them until they're on a Mac formatted disk. You need software on the Mac to do this, getting that first software into the old Mac is a nightmare, because you end up in a catch 22. You can write Mac format disks using special software, but have to get specific format disk images of the software you want. It's tricky but possible.
Which is why my advice would be to get and use an external ZuluSCSI or a MacSD. These both let you copy disk images full of files onto an SD card and mount them as hard disks on the SE. This means you can set up a whole disk in an emulator, then move it over pre set up.
Just to warn you, moving files from a modern computer is generally a bit of a tricky thing to work out. These old computers predate many modern standards. Once you have a way of doing it sorted, you'll be fine.
