pls pls pls

vocabulary and syntax
" i figured that line in doesnt go into line in.
correct

" so i switched from line in to line out. "
grrrr

Line Output ... to ... Line Input

also
you are using different names for the gear
ok for you as you know what you have but we don't and we may not own that gear so stay with the one description
TC Helicon have a few products
you have 3 possible preamps (Mic inputs) that I can see
you have 2 presonus products

tc helicon voice works
Mic input with Line output

presonus eureka rack mount
( I think this is the PreSonus Eureka Channel Strip )
Mic input with Line output

presonus firebox audio interface 3 / 4.
this is the computer interface ?
various inputs ... digital converter and input to the computer

" i was wondering if i could connect my mic to the preamp and the preamp to the tc helicon. "
???
possible in theory
but why do you want to do this ?

These products may have OTHER inputs and outputs so as to make use of them in various ways
they may have Instrument and LINE inputs that will allow you to make use of some of the features in each units

as an example

MIC ...

Mic input of PreSonus Eureka Channel Strip and Line Output
( making use of gain and EQ )

Line Input of TC Helicon Voice Works and Line Output
( making use of De-Ess and Pitch correction )

Line Input of Presonus Firebox audio interface and capture into the computer
( making use of input 3 and the Analog to Digital Converter and the Firewire connection )

these are the 3 products that i am using.
http:// (tc helicon voice works)

http://www.presonus.com/products/Detail.aspx?ProductId=15 (presonus eureka)

http://www.presonus.com/products/Detail.aspx?ProductId=4 (presonus firebox with firewire)

the guy at guitar center told me i am suppose to connect the dual 1/4 cables from the firebox (3/4) into the tc helicon's balanced outputs (left/right). also use a 1/4 cable to connect the tc helicon's line input (mono balanced input) into the presonus eureka's line output. the guitar center rep was explaining to me the tc helicon is being used as an "effect" addon. i've searched other forums in regards to my situation and i've found no answers. I even emailed guitar center and its been over 48 hours and i have yet to receive a response. i'm getting frustrated as is by spending hours on trial and error plugins. i've yet to reach success.

in that scenario he is suggesting to use the tc helicon voice works as an effect device in a Send Return configuration with the presonus firebox with firewire

you will now have to be able to sent up the Send Return configuration in the Software Mixer
... it won't just magicaly work because you have plugged in cables

" the guy at guitar center told me i am suppose to connect the dual 1/4 cables from the firebox (3/4) into the tc helicon's balanced outputs (left/right). "

not quite right

dual 1/4 phono cables
this could mean stereo
this could mean stereo balanced
...
either will probably work

BUT
although the the firebox (3/4) can make a stereo send

" into the tc helicon's balanced outputs (left/right) "
is not where you want them to go
AND
the the tc helicon's voice works has a single mono line input
so this can't be correct

Please stop
...
you have just purchased the tc helicon voice works
...
I must assume you have been successfully using the presonus firebox with firewire and the presonus eureka to record and create songs

so

as a first step
what would you like to do with the tc helicon voice works
in the context of an existing project ?