Even though you are new, you can take a look at this, though it may be a little advanced. Try using file commands, such as load file. That way, you can just do this:
filenum=rnd(5)
read string filenum,STRING$
since I don't know the way your program runs, I couldn't give a more adequate name. Essentially it does the same thing every time, just from a different file (you will need to use OPEN TO READ for all of them). Another way is to OPEN TO READ str(filenum),1 which means that your files will need to be named 0 1 2 3 4 5 (and so on until you hit your max number).
Personally, I like doing it this way, but seeing as how you are new, you should probably stick with invincibobs approach for now, then, once you get that completely working, you can branch out to files.
BTW thanks for not being a noob and having a subject saying "NEED HELP PLZ" and then a body saying "Can someone help me?" Congrats, you actually told us how to help you, so thank you.
Ever notice how in Microsoft word, the word "microsoft" is auto corrected to be "Microsoft" but "macintosh" just gets the dumb red underline?