You are trying to fly before you can crawl. Making a double edged sword or dagger is a pretty advanced project and pulling it off so it looks half decent and is usable as a knife requires alot of basic as well as advanced knowledge and skills that you dont have at this point.
You have alot of reading to do before you attempt your next knife. Read the sticky labeled "newbies good info here" at the top of the forum as already suggested, thats a good starting point but by no means the end of your quest for knowledge. Read thru the threads in the bladesmith questions and answers area, the questions you are going to ask have probably been asked 100 times before. If you get stumpped and can't find the answer then by all means ask, there are alot of people here that are more than willing to help and you will find they are alot more willing to help if you do some research before hand.
There is a whole lot more to making a knife than shaping a piece of steel to resemble one. One of the more important steps you missed was heat treating the blade. Without the heat treating, you might just have well used an old chunk of plain flat bar, you ended up with the same properties in the steel. Any knife you make without the blade being heat treated will be weak and not hold an edge.
I'm not trying to shoot you down or discourage you from making knives, quite the contrary. If you want to make knives put in the time and effort to do it and end up with a usable product for your effort. An ugly knife that is properly heat treated is still a usable knife. A pretty knife that isn't heat treated is not very useful at all other than a wall hanger.
Your first efforts should be a 2-4 inch knife. Concentrate on proper design, heat treating, edge geometry, fit, and finish. Complete the knife 100% and then move on to the next one. One you have smaller knives mastered, then move up in size, maybe a small hunter or bowie.
It is much easier to learn on small blades than large ones. If you screw up a 2 inch blade and have 2 days into it filing and sanding it's alot less discouraging to junk it than if you have a 36 in katana that youve had to file and sand for weeks to get to the same point where you screwed up.
Good luck and happy reading.
Brad
www.andersonknives.ca