Thats good it's on the right track, one thing to keep in mind is do you need this banner to rotate ?, i.e do you have more banners you need to rotate in the same spot. If not then you could just place the txt module in place and your done. If you require it to rotate then all you should need to do from here is open the txt module in edit mode, then up the top in the left corner select the script option, then copy 100% of that script, go to your vendor files, select the vendor you require then select the banner / or create the banner you want.
In the text / script section paste the script you copied from the txt module, then croll up towards the top and select script from the banner type section of dial ups. Name the banner group to a name of your choice, and right at the top you can name the banner it self ( this is seperate to the group name.
Once you have done this save / update the banner, then re open and you should see everything is good. Now go to the page you wish to run the banner on and select the banner module from your modules and place onto your page in a location that suits, then in edit bannner mode in the group name section, type in the group name you applied in the vendor file, then adjust other settings as needed followed by save and your banner should ow be showing.
To add further banners now in the rotation do the same and apply the same group name in the vendor/banner section, this will add additional banners that will rotate on your page.