I concur with Florian - you can download eclipse and add the plug ins needed. IF you are connecting to the cloud version you will need an additional plug in for the cloud connector which is not there by default when you install the standard plug ins for HANA development. Once you install the cloud plug in , you will see that when you are connecting to a system you will have an additional option on the systems tab -- add CLoud system. if you are using the hanatrial edition you need to use the correct host... hanatrial.ondemand.com which is different from the prod version.
further, you will need your p id as your username and your account - it is all documented on the link Florian mentioned above