You can manage your twitter by seeing the profile settings page. I believe using Twitter as a tool is also a great way to generate traffic right? Just a thought.
I use Tweet adder and it manages all of my Twitter accounts. However, there are many different Twitter tools and software available online that are totally FREE. You might want to check them out first.
This is a very vague question....what are you trying to achieve? If it's just one account, it's pretty straightforward, just create, login and start tweeting. Get a software or use some free services (you can easily search on google), if you are managing many accounts
Managing twitter is easy, you need to create an twitter account and try to tweet on regular basis. Try to add some followers on daily basis and click on their link.
Create your profile on twitter and fill all the details in profile page settings.Add friends and build the relations.