SimCity 4 RCI help plz!

RCI help plz!

OK i am having prblems with the rci graph and what my city wants.

OK so here goes

R-$ what is that low,med,heavy dence houses?
R-$$ low,med,heavy dence? how do i get houses to be $$?
R-$$$ ^ same as above ^


Cs-$ - low, med , heavy denceity which one?
CS-$$ how do i get it to be $$ also low med or heavy dence.
Cs-$$$ how? ^ same as above ^

Co-$$$ what is this and how do i get it?

I-ag this is agreculture right?
I-D what is this? how do i get?
I-M what is this hwo do i get?

I-HT what is this how do i get ?


also on the demand graph the positive is they want it RIGHT?
and negative is they dont want it. I know it might be obvious but its kinda messed up when I oplay.. so if anyone can help me with this i would really appreciate it.