or:
on me:1:JOIN:#: .echo -s $chan 0,7 Bienvenido a # 12,0 | .mode $chan +h $me
However, if you've just joined the channel, how can you set a channel mode? You won't be opped at the time. If you've just joined and created the channel, you'll be alone and already opped, so again, the +h would be unnecessary.