1) Sponsorship from miniclip, newgrounds, kongragate etc.
This only applies if you've already made a semi-successful game.
2) Revenue through webpage ads.
It's a stepping stone to get a sponsorship for miniclip, newgrounds etc. Upload a game to their site and get a slice of the revenue of ads. Simple and possibly the best route to go for Construct games if you're inexperienced. You will not get a lot of money, but you will be able to get exposure and credibility.
These are the two 'easy' options, they will allow you to focus on making games and nothing else like security, monetization or back-end integration but, the real big money is probably in the following alternatives..
3) Micro-transactions from within the game.
This works great in an integrated platform like Chrome webstore or Apple iOS because you don't have to handle the upfront support or maintenance of billing. Still requires you to do more than out-of-the-box Construct.
4) So, the big fish is probably to do your own free-to-play game on the web or through facebook. This is very hard and will probably fail, but the return of investment can become very very profitable, there is potentially no roof to the millions of dollars you can find hidden there.
These are what I would call 'good-guys' options, basically if you have a really good game and you strike a good deal, chances are you're going to generate some positive cash flow. Team Meat started this way, they had a sponsored game on newsground that allowed them to strike a deal with microsoft to develop Super Meat Boy.
But you probably need at least 2-3 free games in your trunk, for experience, but also for credibility.
Good Luck :)