Congratulations on the new TT, and Welcome to The Forum! My best advise would be to listen intently and ask a lot of questions during your pre-delivery inspection (PDI)/walk-thru. Then, when you get home, carefully read every piece of literature that comes with your new trailer. An awful lot of "issues" can be avoided/solved if more people would just read their trailer manual. However, if you have questions that aren't covered or are confusing, feel free to post them here. There are an awful lot of folks here with a ton of experience and expertise. They get a great deal of personal satisfaction knowing they've helped someone else out of a jam (or helped avoid one). I know they've helped me immensely. And once you get the hang of things, feel free to "pay it forward" by offering your advise/experience to someone else.
Hope you enjoy your new TT, the JOF, and (especially) the camping lifestyle! Happy camping!