From what you have said...a white knuckle ride for sure!
You picked up the trailer from whom. If it was purchased from a dealer, I am amazed they did not set you up with an equalizer hitch assembly(for a price of course), and then demonstrate how to use it. Again, if this was a dealer it was irresponsible for them to let you drive off with what you had.
Check with a local dealer or RV facility in your area. They will sell you the proper equipment and show you how to set it up. It's not difficult. You will find the TT and TV respond much better when they become a unit.
All that being said, I hope the TV is appropriate for that TT, because, if not, that is a whole other story.
Best of luck and hang in there it gets better.
Ken