Tasks and Offers and primary thing you should do. While doing tasks always read instructions carefully before starting the task itself so you can keep your accuracy high. Check forums about updates on tasks and offers so you can see what tasks are rated ok and what are not by experienced members. More information never hurts.
Offers (in my country there are few) if you have them do them because they can bring you more money then tasks. Read them carefully as well and follow steps. Combine tasks and offers if you want to earn even more. You`ll see what is payed better in your country (tasks or offers). Click every Ad you get, spend as much time as you can on Clixsense. Be persistent.
Try to get yourself some refferals. Important is to be constantly active and precise. Read older topics and Clixsense inside informations. You will learn many new stuff and some good and usefull finesse that way. I know I did.
Its will be much for the beginning. The first step is always the longest.
I wish you sucess, and big numbers of course. Enjoy.