which car key programmer should i need?

[appornelp]

i lost my car key last week, and i want to make a new
one by myself, so i need a tool that can help me.
i search a lot of car key programmers in the internet
but i don't know which one is good so i come here to
ask for help. how about the polo ralph
?
does it good? i hope you can say something that you know.