First time DXM trip. recommended dose?

I am going to try this out tomorrow night. I was thinking of 12 gel pills that come in the wal-tussin box. I'm 145lbs btw. Is this a decent dose for someone trying it their first time? I don't want the most minimal experience, I want one that will deff give me a fun and good experience. I know some people enjoy the DXM trips and some dont, im just hoping I do :)