Okay, so you have a folder, on your local computer, full of sequence files already separated out by sample. Or do you have one single sequence file? Is it a QZA file? ZIP file? Something else?
Assuming you have a folder full of separate sequence files, it sounds like you have everything you need to import your data. You should be able to import the data following Manifest approach. Alternatively, you might also be able to import via CASAVA approach, assuming your file names fit that schema (see the CASAVA description in the link). I prefer to use the manifest approach myself.
If this is not what you have, then I am not sure what you have. As I asked earlier, can you provide some examples of the actual file names of the files you have?
-Mike