Just in case you aren't aware, your data allowance will reset daily for the first ten or twenty days of your service, the days being dependent on what modem you have. Hughesnet does this as a courtesy to allow you to update/upgrade your devices without it affecting what would normally be your monthly data allowance. Sometimes when people come to the service they have a new computer that needs some updates, or an older computer that hasn't been used for a while and needs a LOT of updates, which would eat through a lot of your data allowance in the beginning. So, again, they do this as a courtesy so you can do those things without it negatively affecting you. So, basically, for this initial period you can download and do a LOT more than you would be able to do in a normal month.
Make sure to keep an eye on your data in any of the three ways available. The first is the Hughesnet Status Meter, which you can download at...
The second is signing in at the above site and viewing your data there.
The third is by going to the System Control Center, at...
Remember, keep an eye on your data.
A couple of pieces of advice. If you stream anything, try to stream it in SD or LD. Streaming in HD can use around 3GB per hour. The second piece of advice is that if you have a satellite TV receiver, especially a DirecTV receiver, it's generally not a great idea to connect it to the Hughesnet service. They can use a LOT of data, even when not streaming and the receiver is turned off.
I hope you like the service.
Look to see if there is a Ethernet cable running between your router and the Directv box.
They also can connect wirelessly. Open your routers internal interface and see what devices are listed under "attached devices" or similar.