I would now like to start writing a book (start my writing career). How do I start?
I’m not sure if you mean as far as writing or where to go after that. As for writing a book your first manuscript will be the hardest. Some tips I have came across is devote a certain amount of time to writing it just as you would a job. Like maybe an hour or two without ANY distractions or some don’t use a time limit but rather a set limit of words such as 2500 words a day. But the most important is stick to your original story. When first writing your manuscript you may feel discouraged or run out of ideas for your story and think about another story but if you do this I can guarantee you it will keep on happening. Stick it out, sometimes you may hit a wall but it’ll pass. There are more things but I don’t want to type such a lengthy post. Good Luck.
