Yeah, i got it. But i didn't see a good and specific sripting question in your posts.
You can use csx module to get total kills:
Code:
//csstats.inc
/* Gets overall stats which are stored in file on server
* and updated on every respawn or user disconnect.
* Function returns the position in stats by diff. kills to deaths. */
native get_user_stats(index,stats[8],bodyhits[8]);
/* Gets round stats of player. */
native get_user_rstats(index,stats[8],bodyhits[8]);
/* Gets overall stats which stored in stats.dat file in amx folder
* and updated on every mapchange or user disconnect.
* Function returns next index of stats entry or 0 if no more exists. */
native get_stats(index,stats[8],bodyhits[8],name[],len,authid[] = "",authidlen = 0);
If you want count kills yourself register DeathMsg event and check if killer killed someone else, then increase global variable value + 1