Sorry if this has been posted before, but I can't seem to find the basic rules for multiclassing anywhere so I thought I'd ask.
How do I work out my base saves and BAB if I multiclass?
For example if I start barbarian level 1 and go into fighter level 1 do I add up the bonuses? So I get +4 fort and +2 bab? If I then add a level of Monk do I have 6 fort, 2 reflex, 2 will and still +2 bab?
And what happens if I advance? How do I then work out what my saves and bab are if I take another level in fighter in that situation? As a level 2 fighter has +3 fort +2 bab do I then add that on top of what I already have?? Or does it just get ignored?
Also how does the BAB of your second attack get calculated? I'm a level 6 fighter and multiclass into barbarian is my bab 7/1? or 7/2?
Or if I'm a fifth level fighter and multiclass into barbarian is my bab 6? or is it 6/1?
I'm getting myself really confused, could anybody tell me how it works or link me to the information? Though I can't find anything in the books that tells me.