First, you should attach a screen protector. Then using a stylus pen to replace your finger.
As I don't know which kind of stylus you are looking, so I suggest this stylus catalogue for you: http://www.sourcingmap.com/cell-phon...-980_1872.html
I am using a replacement pen for my Samsung F490 phone. It's Soft rubber tip, let me type with precision and tap or scroll with ease.