You read [CS:S] How to populate your game server but you are still not getting any players into the server. Advertise the server by telling friends and posting the server IP in gaming forums. Read the forum rules and see what their policies are about adverting before you post your server IP. Adverting in forums where it is not allowed can get your account banned.
When posting say that you just got a new server and you need people to help you populate it. Don't say something like "come join my server because it is the best."
Another good thing to post is where the server is hosted from like if it's from chicago put that in the post also how many slots the server has and other small details.
Ex...
Noob Gamers
css.noobserver.com:27015
New York City - TICK 100
20 Slots
Places that allow clan recruitment
xfire.com
fpsbanana.com
server.counter-strike.net
forums.filefront.com
clan-less.com
halflife2.net
fpsadmin.com
sourceradio.com
clanrecruiter.co.uk
cstrike-planet.com
counterstrikesource.com
purepwnage.com
cssboards.com
tsviewer.com
and many more...
How to advertise your game server 
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