Depression is not that kind of thing you can overcome overnight. It will take a lot of effort to tackle it but what you should keep in mind is that it is possible.
Perhaps, the most important thing to remember in this respect is to start small. Choose one or a few goals and work towards them. It will give you the sense of accomplishment as well as help you continue going forward. What is also significant is to have a circle of supporters. You will have someone you can talk to. Apart from that, you will most likely meet people who are either going through or have already gone through the same which might motivate you to keep going.
Do not forget that reaching out for help is necessary. It is not a weakness. It is actually really brave and strong. Besides, it is also useful to keep busy as well as to engage in various social activities. It will help you to stay focused on something else as well as take your mind off depressing things.