The Logic Off Topic list

I'm a singer/songwriter.  I work with studios to write songs.  I 
don't play instruments much, but I can dibble dabble on piano to hear 
sounds.  So far, how I work is to have the producers give me some 
sort of base tracks on a CD and writing melody and lyrics to that and 
then record when I get back into the studio.  That has worked so 
far.  But it becomes cumbersome when I want to deviate from the base 
track.  I want the freedom to arrange things myself as I am working 
out the melody and lyrics.

I think Logic can be the solution.  I am not looking to have a home 
studio.  All I need is enough so I can create my own base track and 
at some point in the future, I would want to be able to record voice 
as well.  So, it's pretty basic.  I know this is very basic, but it 
would allow me to be a much freer artist. Can people tell me what 
exactly do I need equipment-wise to do all this?  Thanks!