Luis,
people here are always prepared to share their knowledge, so the lesson should be smooth if you are prepared to listen :-)
I'll try to put together all fact that make it quite obvious that your blade and mounts are modern, low quality items:
1. Shape: very unusual for a tanto
2. No hamon (temperline) - your hamon is etched, it is not the result of tempering.
3. Habaki (metal collar which keeps blade in the sheath): no Japanese habaki has a ridge, except maybe for some habaki on ken
4. Nakago (tang) - unregular shape, fresh red artificially rust induced by the maker, signature sloppy, unusual and sloppy filemarks
5. Mountings (handle and sheath): strange, light alloy - this is not copper aor any of its alloys. Besides, this is a cast piece, no craftsmanship whatsoever here
The way for you to go:
1. visit a few websites with information about nihonto (start with http://home.earthlink.net/~steinrl/nihonto.htm , http://www.ksky.ne.jp/~sumie99/information.html , http://www.nihontocraft.com/japanese_sword_terms.html , but there are many others) - you will find a wealth of links on the NMB welcome page: http://nihontomessageboard.com/
1 a. read whatever you find interesting among the threads of this forum
2. visit dealer websites: http://aoi-art.com/ and http://yakiba.com/nihonto.htm to start with
3. buy a few books, you might start with three, but you will need many, many more:
Samurai Sword a Handbook, J.M. Yumoto
The Craft of the Japanese Sword, Leon Kapp, et al
The Japanese Sword A Comprehensive Guide (Japanese Arts Library), Kanzan Sato, Joe Earle
4. Ask some benevolent collector to show you a real Japanese art sword or maybe go to a sword show (observe the strict etiquette)
5. Buy more books
6. Once you know sword periods and main schools and you take a liking in one of them, consider buying a sword (be patient, don't jump on any sword you see, come back here for advice when you think of buying).
I guess that is all. Everyone here has gone more or less the same way. Good luck to you. We would love to see you back here :-)