Hosts file changes not taking

hi forum
i need to access a site i have uploaded to my server but the DNS doesnt point to my server at present so i have learnt that i need to edit the HOSTS file.
i can get to it with "sudo nano /private/etc/hosts" and have editted it but it doesnt work. I have logged off and on. A few questions if i may:
do i need to be an admin or in root access?
when i edit my entry so that my hosting, IP 1.2.3.4 goes to www.mydom.com does my entry need to be:
1.2.3.4 www.mydom.com
or
1.2.3.4 mydom.com
or
1.2.3.4 http://www.mydom.com
or does it not matter?
Also it seem my hosting has 4 IPs. Server IP has one and each of 3 nameservers has separate and different IPs. Which do i use? i have instinctively used the main server IP.
Thanks

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