It is strongly recommended for each developer to conduct the decent ASO before launching an App in Store.
The [b]ASO (App Store Optimization[/b]) will help your app to get the organic traffic due to users’ searches in Store.
Optimization implies the selection of popular keywords which will boost your App in search result position.
Also it second to none activity to make your app attractive and catching for target users. Here you need to pay attention on screenshots and icon of your App. Besides, presence of positive reviews will be appropriate here also as users go through them as main criteria of quality.
And of course, the App installs are very important for generating traffic for first period while you have launched. It helps to reach top charts and generate honest interest in target audience. There are a lot of app promotion providers which can help you in buying incent traffic (e.g. [b]MoPeak[/b]) and the result of it will be noticeable in short period.