Take your time, do not be in a hurry. Look at everything that interests you.
When you narrow it down to a certain type/make, start asking questions.
Ask lots of questions BEFORE you give the seller any money or sign any papers. Someone on the forum will have the answer.
If negotiating with a dealer, get it in writing. Otherwise what they tell or promise you means absolutely nothing.
Don't buy something, new or used, until everything is repaired or working to your satisfaction.
I would rather buy from a private sale than a dealer.
Enjoy your search and use it as a learning experience.