Arc or "stick" welding is not ideal for stainless steel. It is advisable to use MIG or TIG welding instead, with argon shield gas.
I would only advise manual arc welding as a last resort, or for field repairs. Expect corrosion issues, and issues with excessive oxidation and porosity in your stainless welds. Manual arc welding is a "dirty" process and simply does not protect the weld puddle well enough from oxidation and carbon pickup, which are especially damaging in sensitive stainless alloys.
As to whether to use AC or DC for stick welding, you should consult the instructions found on the box of electrodes. If polarity and current recommendations cannot be found, then you should contact the manufacturer and get it in writing.
You should probably not make welding decisions based on advice from a sales representative. Firstly is is not documented. Secondly, sales representatives are not legally liable for damages caused by weld failures, YOU are.
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