Writing to Files

Hey All, I have recently been trying to create some logs for the install script I have been making (to make it easier for me to diagnose problems) but I am wondering how to create and write to text files. I know about the fopen() and fwrite() functions, which theoretically should enable me to do this however I am not exactly sure how I should go about this. Also, I realize that there is limited formatting I can have with text, however I would like to know if its possible to control the line spacing between the entries, and whether or not its possible to indent lines. Lastly, are text files a good idea for logs? Do any of you use anything else I should be aware of? Thanks for all your help!