4k pageviews with 400 clicks out of that? Wow that's actually really good, must be all unique traffic and no returning visitors as odds are returning users wouldn't be clicking ads because they know ad placement and whatnot. Wow I gotta work on my marketing scheme a bit more, I haven't had results like that in... well ever!
If you call Google "normal" then... That's normal. Looks like mostly n00bs answering this thread. You'll learn. Waste of money - Adwords - Unless you have a lot of it to blow out your behind. That's what will happen, you will lose money long before you break even. I would not waste my money on it until you know the best strategies. That is my opinion, take it for what it's worth. Adsense? Wouldn't waste my breath on that foolishness. I know people are believers. I lost my "belief" when they ripped me off for 1200 bucks. That was only once they did that... Won't happen again. Not in my lifetime. Good luck with your Google thing.
Low ctr is mainly due to 1. bad ad placement 2. Content not Unique 3. Website is not having user interactivity
I think that is not normal, ussually the percent of clicks are bigger that 2, but if the source of your traffic is some social media, than it is OK.
%0.3 No, it is not fine. There might be 3 reasons: 1. Your ad placement is poor. 2. Ads are irrelevant. 2. Both.