No one is willing to listen to a boring presenter on radio. That is probably the last thing anyone would do. Since radio is not a visual medium, your voice and the words you speak carry more value than anything else.
One of the important qualities for a radio presenter is to have something to say and say it with passion. This is what makes a radio content great. Above all, when you are genuinely interested in something, it does come out much better than you had expected.
You might assume that your show went well, but before that think about checking your show again. Write down some learning points or mistakes that you did during the show so that you can avoid them the next time.
Do not address your listeners collectively. Use single person addressing so that it sounds more like you are talking to them when they are listening to your show.
Use social media to help you. Instant tweets and Facebook posts about what is happening in your show can help you in getting a larger audience. Social media is also the easiest way to get acorss with a lot of people across the globe.
Most important of all is, understand your audiences well and speak about things that they can relate to easily. For example, if you are catering to young audiences, you could speak about the latest gadgets etc. to get them hooked.
If you keep these points in mind, you should be able to start your path to being a great radio jockey.