Having a hard time understanding Traffic Shaping

Hello All, I'm currently using 2 Fortigate 201E setup for HA.

 

Our current ISP is giving us 50Mbs

 

We just moved from Cisco ASA's to these new Fortigate Firewalls.

 

Before the switch there was never any bandwidth issue.

 

Problem is now it seems Downloading and uploading files takes way to long only getting like 500kbs per second.

 

Now I know this can be rectified using Traffic shaping.

 

I'll explain my Environment and what I need to do and hopefully someone can explain how I can setup my Shapers to work within that situation.

 

Sales force is our Top priority so when someone goes there they need to be able to browse it and any attachments really quickly so Give it a High Priority, Next would be downloads/Uploads as people are always uploading stuff to youtube here and Downloading attachments etc from websites. Lowest Priority would be Drop box downloading and uploading stuff there however it needs to be relatively quick for those that use it to upload a 3gb file shouldn't take 3 hours if you catch my drift, Our current ISP is giving us 50Mbs we are upgrading that soon to 100 but in the meantime that's what I'm working with

Then everything else would fall into another category on it's own I suppose. Currently 1 user can take up all the bandwidth syncing his drop box. So I'd like everyone to share the 50MB equally so that 1 user can't hog all the bandwidth.

 

I'm really new to Fortigate OS and networking in general so I apologize in advance but really need to figure this out.

 

Many thanks in advance.