Help with resetting a router (NETGEAR)?

A lot of questions to start. But first the details to my situation.
1) I have a Netgear WPN 824 v2 Router. I do not have the WEP code to access the router wirelessly nor do I have the actual password to check the settings in the router. Somehow its changed from admin and password to, well, something else.
2) Please keep in mind I will be trying to connect at least 3 other computer wirelessly to the network and so I need instructions for them also.
3) My ISP is through Time Warner Cable.

Now onto the questions.
1) If I physically reset the WPN 824v2 Netgear router, will I lose internet connection? Is there anything I should know (assume I know absolutely nothing) regarding how-to connect and set up wireless connections.
2) We currently have a network set up with many computers connecting to the network. If I reseted the router, how would I go about setting up the connection securely for both the main desktop computer and the other computers connecting wirelessly.
Any other information would be great

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