1. What the hell is primer. A primer is a base coat that helps the final coat stick better to the model. It is usually gray or white and comes in various degrees of thickness. You can also use primer to find problem areas such as scuffs, divits, ejector pin marks, etc. Be careful, too much primer can fill in panel lines.
2. What is the putty. Putty is just a filler for cracks, holes, etc. Squadron makes a popular putty line. Most around here have several different kinds of putty depending on the size of the problem area. Some use Tamiya putty or Miliput (a two part putty... have to mix them together so they harden) or Mr. Surfacer 500 or 1000 (actually these are primers, but can be used to fill small areas like putty).
3. Where can you buy all these paints your used. I use my local hobby store. You can also use ehobbies.com, Squadron.com, and a variety of others.... just search on Google.
4. What's an oil wash? This is an oil based paint that has been thinned down to about 8 parts thinner to 1 part oil paint. This is mixed well and dabbed gently into panel lines... the capillary action of the paint will make the paint flow through the panel lines, thus enhancing the panel lines.
5. How do you accent the lines on the plane? An oil wash does this most effectively. You can also use pastel chalks, fine pencils, and shading techniques (only for the best airbrushers!)
6. Any guides online about these newb questions? Keep reading the wm Cheng threads... he has a link to all his old threads in this forum. Also there are tips in FineScale modeler, a modeling magazine. You can check it out online at finescale.com. Personally, I like starshipmodeler.com... those guys over there have been very helpful.
Hope this helps.