The important thing to realise with Twitter is that it is assymetric. You don’t have to follow back and people you follow don’t have to follow you. This is an advantage to you, but you need to take that advantage.
Because there is no absolute requirement for reciprocal following on twitter, it means following and followers can behave in different ways. Also if you retweet information you read from someone you follow, it is helpful if the people who follow you don’t follow them too, or you get a closed loop. The more variety you can get into your following/followers the better the distribution of your content can be, but this needs to be balanced with other objectives like conversation opportunities.
Follow the people whose content you want to read. Don’t follow to get followers, whilst quantity is important it doesn’t replace quality, you’ll just end up with a huge stream. (Listen to me I follow thousands… but I’m not looking to increase my following to do it, I have other reasons!).
With getting followers the entire focus must be what you share. Be useful. People (and twitters suggested followers tool) will find you and suggest you to others based on how useful you are.
Written the plan yet?
If you have a marketing strategy work out who your audience is and what you’re going to share with them.
Share it with twitter as a whole and people looking will find you.Link twitter up with your other tools – my account didn’t really take off until I started blogging and had something to share people wanted to hear about.
Where the people you want to follow you are ones you’d want to follow anyway (e.g. prospective clients you want to have conversations with and develop a relationship) follow them too and they’ll check you out.
But don’t follow indiscriminately , there is enough noise online. Use search instead to find the right people.