Since you're new at this, you should expect some learning curve. However, if you launch the InstallShield Tuner, you'll see an overview of what it does. Go ahead and click on the selection to Create a new Transform, browse to where your .msi file is and follow the steps. It's really not too difficult and once you've done it a couple of times you'll be a pro at it..... 😉
...and the beauty part of working with Transforms is you can do it over and over until you get it right. No rebuilding systems or snapshots involved.