I hope the more experienced members will add to this with their words of wisdom and over time it will become a valuable resource for the newcomers who wish to make money on the computer.
First thing I would say is don't try to do every money making method you see find at once, find a couple of ideas that you like the sound of and give it a good go for a few weeks before deciding if it's for you or not. Flitting from one system to another without giving the first a fair go will get you nowhere.
The best / quickest / easiest money making method for someone else may not be the same for you.
Write down everything you enjoy or are good at - there's no point wanting to make money on the computer writing articles if you struggle with the English language and it takes 5 hours to write 300 words(My grammar is awful, I know I would never cut it as a serious writer!) but can your draw, design, inspire, teach, sell?
Find someone you admire and stalk them! (don't get yourself arrested or anything like that though lol).
Decide what you want - do you want to start a new online business, build an empire and live life sipping cocktails by the pool; or are you just happy to earn $10 a day doing any little jobs?
Set your goals and work towards them every day, the goals can change but you should always be working towards something.
Note your successes, not your failures! You have to earn a cent to get to your first dollar - and if you can make $1 then you can make $100, if you can make $100...you see where I'm going

We all fail sometimes, but is it really a failure if we learn something from it?
Don't give up if your first attempt doesn't work out, or your second, or third.......
Spend 10% of your time reading and 90% doing - you're not going to get anywhere just reading about how others are making money online! Don’t Delay, Nobody knows how much time they have left to realise their dreams, and we must remember that none of us have forever
Be realistic with your time management, if you have a family, or a regular job, college, etc. Work out a schedule of when you can devote time to your money making efforts and stick to it.
When the going gets tough, remember what motivated you to want to make money on the computer in the first place - have that dream car / house as your wallpaper, stick your goals on the fridge - watch a motivational video - whatever it takes to get your mojo back!