I am brewing my first batch and I was thinking of adding stuff like lemon or herbs to make the flavor different. Is this a good idea and at what stage can I do this? Pluse any suggustions on what to add?
I wouldn't make any changes on the first batch. You won't know whether you made a mistake in your process or if you chose the wrong ingredients to add and their flavor didn't fit in with the beer.
I've done quite a few brews and the ones I was most tempted to dump were the ones with fruit additions. I've choked them down but I wonder why I tried such a foolish thing as to add that particular fruit.
When you have your 20th or so brew behind you, then think about adding fruit. Then forget it and just concentrate on making the best beer you can.
Pff, I say caution is overrated. If you want to dump some herbs or fruit in, why not? 20 brews before you dare to experiment is horseradish.