I often use just the noodles from a package of ramen although you can sometimes find them. The noodles that come with Nongshim and Paldo instants are pretty good. Ive yet to find any that are the same.
Some suggestions for those that want to avoid the huge amount of garbage in the season packets.....
Riken instant Dashi stock....No MSG or added salt. Available in 3 or 4 flavors including vegan. Its sold in little paper tubes which are enough for about 600-700ml of stock.
http://www.pacificeastwest.com/4903307486000.html
Assi seafood soup stock. Not exactly low sodium or free of MSG but way better than those packets.
FIsh sauce....Oh man does it stink at first but it works well for a bit of salt and umami.
Miso. nearly any Asian market sells real Japanese miso and its fairly cheap too. A little goes a long way. Combined with a little dashi stock its awesome.
Fish balls...No they are not fish testicles. I love these in ramen. Just boil them or steam and add to your ramen. These are a real PITA to make from scratch but are widely available at Asian markets in the frozen foods section. Other varieties include squid, shrimp, pork and even beef. They are nothing like a Italian meat ball.
Korean mild pepper flakes....To me these are about perfect for a bowl of ramen. Easy on the heat but huge on flavor..
Korean style wheat noodles. If you like thick chewy noodles these rock. Somewhat similar to Japanese udon but not quite, They are usually fresh or frozen. I always cook these separate from the stock. Sometimes a little under cooked then added at the last minute to boiling stock.
These are the correct noodles for Korean noodle soup called Jjamppong aka Champpong and Korean black bean noodles.
http://www.maangchi.com/ingredient/jja-jjang-myun-noodles