Right friggin on!!
My buddy found a small tank on kijiji for $100 and exchanged it at Praxair for a full tank of C25. Good deal, might want to keep your eyes open.
If you get ok at welding with flux and move to gas, you'll be amazing with gas. Gas is SO easy compared to flux.
With flux, just make sure you get a stainless steel brush and brush away the "film" each time you stop the weld. Restarting without brushing will contaminate the weld. It does make you consider your welds more carefully and concentrate on doing long smooth welds.
This link expires in 72 hours, so grab this.. I just uploaded to my storage space.
Haynes Welding Manual
Curious, what are you using to cut the metal?