The job requirements will vary depending on the individual shop you land in or if you even have a shop at all. I won't call them requirements more like suggestions for making it far into a successful welding career. In no particular order, drive is a big one. You have to want to improve and master your process (because there's three main welding processes) and get as much time as you can under the hood and actually welding material. Then would be education. Are you going to a trade school or community College for classes. Do you want to join a union and get certified that way. Thirdly would be certifications but you can combine that with number two. Fourth most valuable skill you'll need would be to learn how to read a tape measure. If you can't determine the measurements of the material you're working on then you aren't very useful.
Hope this helps and good luck.