I have practised doing the video again on Adobe After Effects just so I get prepared for doing my actual trailer. I have learnt how to make the text fade in and out and also that I need preferable use Adobe Premiere Pro to fade in the music for my Creative Media teacher (Em Brodgen) has told me that Adobe After Effects does not have a feature to fade in the music. To do this I exported the video on Adobe After Effects with no music and and edited the video again on Adobe Premiere Pro.
This is a video of me practising how to fade in and out the logos for my video.