Things to remember when setting up a home wi-fi network... Setting up home Wi-Fi? 7 things to remember November 03,2015
I would add that you may find that you need a wifi booster to reach some spots. The side of my house that lies with two bathrooms between it and the router did not get any meaningful service compared to the rooms on the other side of the hall. You could connect in those rooms, but that is about all you could do. We put a signal amplifier in and now that area gets as good speed as if you were beside the router.
A wireless booster does not wondrously fix bad speeds. If you place it in your room where your device currently gets a poor signal, the booster will now get a poor signal and then retransmit it making it even worse. Also, other problems with the booster are when on the same channel and therefore the router and the booster having interference with each other. I'd say just run a cable and put another router. That's what I did. I have the TP-Link TL-WR841N which is pretty cheap and one of the best hardware out there. Run the LAN through an unmanned switch, from there pull three cables, one for each room, and place TL-WR841Ns at the end of every cable. You can also make the setup without the switch. Just connect all routers to one of the routers that'll serve as a main. Other's will take settings through the DHCP. Just don't forget to change the IPs of the routers or it won't work.
I had a booster that cost nearly $200! IT SUCKED! And it was from a great company, ASUS. The hardware keeps getting so much better. Threw out the ASUS booster and R&R old router with http://www.shoppingexpress.com.au/assets/full/BRT-AC828.jpg Just, made all the difference. Have to adapt my needs to new tech.