Regarding bridging another older wireless router. Would this method enhance the signal to my wireless Roku device that’s in another location of the house? The Roku is just a wireless device; no wired connection.
Bridging as the name suggests, means you build a bridge between two things, in this case from an Ethernet cable, via the wireless bridge back to an Ethernet cable.
In a real world scenario that usually means that your second router is acting just like a wireless client, a device and doesn't offer any wireless signal itself. The second router would only offer wired access.
If you want to have a wireless connection between the two routers while also offering wireless access on the second one you have two options:
(2) Repeater Bridge
Neither one is guaranteed to work on "every" router you have lying around. It works on some, it doesn't work on others. In most cases, you do need a custom firmware like DD-WRT to be able to do it as the stock firmware often doesn't have that option.
Your other option would be to simply setup the second router as a wireless access point offering it's own wireless network, or allowing "roaming access" by using the same SSID and security settings as the first router.
When setting up a WAP you do need a wired connection between the two routers. If that is not a direct option you might want to look into powerlan adapter
I do have a direct access router Cisco already set-up in my living-room and a older Linksys router not set up, yet but going to give it a try according to your website instructions. Everything is on one floor but separate rooms divided by several walls. Say I put the older Linksys in the other room with my three wireless devices, one being a Roku player do you think this will this strengthen the signal?
well it depends where you put your second router and the setup that you use your routers.
i use two linksys WRT120N for my two story home one with direct access to internet and the second one using bridged networking using DD-WRT v24-sp2 (10/10/09) mini firmware and it covers every corner of my house it dos not interrupt video playing.
hope this helps!