You should be careful with liquid liner, especially if you can't use it properly.
My friend got it in her eye and got a massive infection. Not trying to scare or anything
I generally prefer pencil and apply it to the insides of the eyes. This takes practice and at first your eye will probably flintch and water. So give it time.
If you use google there are hundreds of on-line tutorials with videos and pictures to help.
You should experiment different ways and don't worry if you don't get it at first. It takes everyone time to develop a style in applying makeup.
Alternatively, go to your local cosmetic store and they usually have people there waiting to do your make up so they could show you and answer any questions you have.