first adb action

Hi to all. I'm Abe Wayer.
I'm dreaming to start changing at first my own mobile OS end maybe going to develop a day.
Today it's just all the afternoon that i google....
I became root, I partitioned my sd and installing sdk & adb tools in a couple of days.

something goes quickly something not.

I have a galaxy ace with 2.3.6

I thought to start my develop time using adb.
first at all adb push.

So i made:

adb push test.txt /sdcard/test.txt


And i have: permission denied

I googled a lot and nothing worked:

Debug usb is on.
I umounted sdcard from /media (I use linux)

I've tried this as well:

mount -o remount , rw /dev/block/void/179:9 /sdcard

or

mount -r -w -o remount -t vfat /dev/block/void/179:9 /sdcard

But nothing work!

If im not able to push a file on a sd what i dream for?

My sdcard has two partition linux call them sdc1 & sdc2 first is 1500 Mib second 400

Thanks for your help :)