Stainless steel welding is tricky and will present challenges for even experienced welders. If you are used to welding steel and iron and a lot of the more common metals it is a mistake to think that you can just jump into stainless steel welding.
Really the best advice I could give any new welder is to take a class specifically in stainless steel welding. You will get all the instruction you need in the tools, materials and technique. Without a solid background in these fundamentals, there is the very real risk you will have a serious accident.