I use the Wort app for Android that comes with a style guide. Styles give a particular malt, hops, IBU ect.
I never try and emulate anything, I just go for a guide. For my simple Lager at the weekend I used
4kg Irish Lager Malt,
50g Saaz 60 minutes
25g Saz 15 minutes
25g Saaz at 1 minute...