Trailer novice here, can you help me plug in my TT?

Thank you all so much! Now I fully understand what I have and what I need.

Definitely will get a 30' or 50' cord as pictured, with a female twist lock with a screw-down collar on one end and a standard male 30amp on the other.

I also read on another thread about not using the dryer hookup because of the 220 situation, I won't do it.

Thanks to everyone who responded and thank you for helping me figure this out!