trying to create a scaleable image...

I'm trying to create a new patch/emblem for my fire department and drew a 
maltese cross using vector tools having quite a few lines drawn out to my 
liking and "connected" to form the maltese cross.  That looks just
fine.  Now 
here is my delimna....

 I want to be able to scale this maltese cross so I tried things like 
flattening to create one object and exporting as a Tiff and also JPG and can 
create a new image and import them and scale them.  However, I cannot fill just

the inside portion of the maltese cross with a color.  I have the canvas with a

transparent background (I see the checkerboarding) and the original cross had 
the inside filled to a solid color with the outside of the cross being 
transparent as well.  But after i import the cross into a new application it 
has the look of a white background and I cant select just the inside of the 
cross to change its inner appearance.

 I might be doing this wrong from step one, but hopefully someone can point 
something helpfull out to me.  Once I can get that part taken cared of I can 
add my additional layers that I already have set up.

 Many thanks in advance!

If you drew it with the Pen Tool, you should see new 'Path' layer. Assumming 
your artwork is a closed Path, select it, and look down in the Properties 
Inspector- then alter the Fill Color option available for that Path.

 You should also easily be able to Free Transform (Ctrl/Command + T), or Modify

> Transform or use the Scale tool on the active Vector object.

 Also no needto Flatten, becuase then you loose the vector editibility and the 
ease to change Stroke/Fill options of the original object Layer.