Firewall and using a Router?

When i first connected my router, i couldn’t get any signals. Than i was suggested that i should disable my firewall (Comodo) on my computer. I did disable it and was able to connect. Right now my Comodo Firewall is disabled, after connecting to the internet, should i enable Comodo or will that create a conflict. I was also told that routers already have firewall in them, so having one on my computer may create problems? Thanks for your input.

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