Create a Promoting Video for smart phone application

i have app on iPhone and android i saw in YouTube video for Dubai police app i just want u to see to get the concept how i want [login to view URL] my app in Arabic , regarding the voice no problem i can let my friend record for me and add his voice to the video , but the most important that i need really professional video the video will show from how to install the app , then register in app , then browsing the app , then add post , because the app to sale goods from other users , then show the promotion page page then show some features