Read
this topic and also
this.
When You get this bot to work - write in Your podbot.cfg file this line
min_bots=0
max_bots=1
This way if no one will paly on the server You will have still one bot on it. When Someone joins thi sbot will be automatically kicked out. But if someone will join and it will see there is no player on Your server - it will feave it. So maybe put some more bots on this sserver (for example max_bots=4)?
More info about podbot mm commands read
here.