I agree with the above posted that suggested you try out Ubertwitter. It is the best app out there right now in terms of function. Twitterberry also runs good but you can not do as much from within the app itself.
If you are looking for people to follow, I would suggest you go to some of the directory sites that are sprouting up all over the place. A good one to start with is
wefollow. Just go there and type in a keyword that describes what type of person you would like to follow and hundreds will pop up. You can also sign up for 3 categories to include yourself in so people can find you as well. Then you just have to start following people. The more you follow and the more you tweet the more people will start following you.
Any other questions you can send me a message on Twitter just type @Ask4Prayer in your text box and then the message and it will go right to me. I will be glad to help in anyway that I can.