Went to VOIP a few months ago and have a WiFi, modem,router. But only has access for 4. Have it set up One for VOIP, 3 for desktops. But I need a 5th for my dish TV so I can watch Netflix and other online things. My question is can I just split a line (connect two lines to one outlet) or do I need a new router/modem with 5 outlets?
cheapest option would be to get a switch, a decent one would cost you around $15 - $20 with 8 ports on it , one goes to your modem/router and then gives you 7 ports free, you will need to plug one of the cables in your router to the switch to make room for the cable that feeds the switch but no extra set up needed
Some switches might require you to put the cable from your modem in the #1 port.
The other option is to actually buy a real router, and set your modem to bridge mode, because 99% of the time, the modem/router/wifi combos that US ISPs foist on you really really suck.
But that’s going to require a lot more research 
So if you’re happy with your current setup and just want to add some extra ports: Get a switch
If you have a good wifi router your Dish receiver should be able to connect via wifi. We have the hopper which has Netflix and the wifi works good to connect to your internet