Evexa: I use this one that's an AIPTEK brand, called "Hyper Pen 12000u". It's big, and it was cheap--it was $150 at CompUSA (but they accidentally had it down for $100, so they had to give it to me for that price). I like it, although I come across occasional problems with it blitzing and then I have to either unplug it or restart my computer. But as long as I don't drop my stylus on it or put a lot of weight on it or move it around, it's good. I know people who've had much worse problems than I with the AIPTEK brand. I found out after I got it that it's a generic brand, and the more high-quality ones are either Wacom or Intuous. So I would recommend a Wacom. And I've heard that really, it's not too bad to have a small tablet, because it's easier to draw smooth lines, and you can always zoom in for details. So I think a small-sized Wacom would be a good idea for you to get, especially to start out, since you've gotta find out whether you even LIKE tablets!
Marrimoda: I'm kinda confused about your question on Photoshop, but I'll try and ramble and hope that something answers that question! So I draw my outlines on one layer (and make sure it's not the background layer, because you can't color beneath that, so you need to start a new layer). Then, underneath that on another new layer, I color in. A lot of times, I can just color in with my drawing tablet. But when I'm just filling some outlines, there's a really cool tool to select stuff so you can just fill it in. There's that magic wand tool that's OKAY, where you click and everything that's within some outlines is selected. THe problem with that tool is....well you see--if you zoom in on your outlines, you'll see they're not all black (or whatever color). They've got these fading grey pixels around them. That's what gives it this look that it's a straight line, rather than being all grainy like how it would look if you drew on MSPaint. When you use the magic wand tool, it selects all the white area, but not any of those light grey pixels near the black. So when you fill with a color, you'll see that there's this line between the outline and the color that appears to be white. Those pixels are actually slightly grey, and so yeah, it doesn't look too good. Instead, you could use the polygonal lasso, which is under the regular lasso tool if you right click on it. With this, you can be really maticulous and go around all your outlines to fill in a good way. But a tool that's even cooler than this is the "magnetic polygonal lasso" that's also under the regular lasso if you right click on it. This thing is sometimes a little messed up to use, but generally, it magnetizes to lines as you put your cursor over them, and when you select and area with it and fill, it typically looks really good! Yeah. But no, I don't copy the lines. Argh I hope something in there answered your question!
Also, if you're scanning in your outlines, that would be a case where you select the outlines, which start out on the background layer, cut, and paste in a new layer so that it's not on the background, and then color beneath that. But in order to color beneath it, you have to select the outline layer, and go to that drop menu in the layer window that currently says "Normal" and select "Multiply". That makes it so that the lighter the pixels, the more transparent, and the closer to black, the less transparent.
Anyway, if I didn't answer your question, feel free to ask it in another way or something! Maybe I'm just in a dense mood today.