These are all of the thoughts that came up my mind while I was beginning to write this text. But then I thought more and more and I realised that only thinking is not going to help. You need to begin. Pick a random topic that pops in your mind and start off. Begin with a sentence on the description of the topic and you're off. Write the next two lines in support to the first sentence you wrote. And then recursively write the next two sentences on support to the recently written sentences. As you come to the point where you have written three to four sentences, you will realise that it is very easy. You are likely to arrive at a situation where you have ideas related to your chosen topic but a bit different from the things you have written. Write them too. In fact, write everything that comes to your mind. End, when you believe that you have explained that idea well enough.
The text is written and the task is accomplished. And the mind goes, "Is this good writing?", "Is the topic correct for this text?", "Have I gone in same direction throughout the text?" or the number of doubts that might occur. The final thing to do is to read your text a number of times. It has very great benefits including the one's that clears the doubts that I've mentioned. Reading your currently written text helps you to correct any mistakes. It has also helps to select a more suitable topic for the text that has just been written.
