ovulation test help ?

Hello ladies , first of I love this app :) I am soon going to start ttc with my hubby but we have been living overseas for the past few years. Ovulation tests are not that common here , I'm going to have my mother ship me a few from the states. Which ones are best ? Can any of you tell me any tips ? How do the work ?? 
I don't know a lot about them since I never really had to bother with them until now so any tips and advice would be much appreciated. 
Thank you in advance ☺️