How long does it usually take to settle in a online business? For instance lets talk about domaining and adwords. Its great if anyone has personal experience with these
Depends on kind of business. If you have goods to sell, money to pay for setting and maintaining website for you (including its security if you are making transactions) and promote it to make it findable through the search engines, then few months.
For domaining you have to know how to do that - not only how to register domain name, and have a lot of money to do that. People in domainining are operating hundreds of domains, without quitting their day job. I tried to find any realistic details online and couldn't. Maybe someone answers your question.
Adsense: you have to make a high traffic high quality content website, updated frequently. After you made that, and get approved by Adsense, few years to get noticeable income.
How can we find out the PPC cost of an ad of a keyword in adwords? Is that possible?