I have a new blog and long-tail keyword has been chosen. I am doing following work right now, any advises or tips? 1. Content writing 2. SEO should I hire experts or use paid service instead of doing it myself?
If you can write content yourself, then you should try to do so. It is cheap and you gain valuable experience in content writing which will benefit you in the long run. SEO is very important, in many instances it can make or break your AdSense site so it isn't something that you can skip. There are lots of tutorials for beginner AdSense users. One of my sites goes through the basics of SEO and content writing just follow the links in my signature below.
There are lots of SEO tutorials available in search engine. Opera is helpful, because for the new and worthily site we can save the page for further classification. In the beginning, be slow and steady.