create the table first in mysql then use the LOAD DATA INFILE to bring your text file into the mysql database table.
I would do that first because you then have all the data into mysql to work with.
You then can figure out what tables you need to move your database towards normalization. you can then do a select out of this first table on only the fields you need for each of the other tables.
(i.e. you might want to create one for contact info of each supplier, you would then only select the fields from the master table that you would need in the contact table. you could assign an autoincrement field or something to identify the suppliers or whatever).
finally, when you are happy with all your other tables you can delete the initial table from your database.