I quite interested to try out wireless flash trigger
But i google it there are many brand and some is cheap and expensive
What is the difference between the cheap and expensive?
And what brand do you recommend?
The main difference is whether they support ETTL flash metering or not.
If you set up everything manually then any cheap trigger will do. Even an optical slave can do the job (but check for the preflash).
If you need ETTL then the trigger needs to support this and it has to fit to your camera system (brand).
Here you go... this is a good start