[KWo]

I cannot answer - You need to ask Valve (the question is related to CS requirements, not bots requirements). What I can say is this - I think (I may be wrong) it's sufficient for normal game playing, but if Your players will need to download the map, models and other stuff to play any non-standard map, they may need to wait long time to download all this stuff before playing. But this will happen only once for a map for a particular player.
Instead keep asking - setup the server and just try. It will take You less time when You experience it Your-self than You will ask about something no one here can really answer You (since we are not testing our stuff to see what are the minimum requirements). But when You will see the results on Your server - please write us the info here about Your tests with Your server and internet - I mean if You can play good or not there.
About the question who need the info - Your human players need to see where are bots and what they are doing. But I think - to send that info to 1 player - it's one packet on the LAN. The packet will be longer or shorter only depanding of how many players is there (how many infos about different players You need to send to one player).