4) Would the font end up looking more crisp if I made the EM/pointsize large?

I am still not sure just how to set the point size (size of font), but I think I read that you could have 4096 x 4096 points. Sounded large, but if that improves the fidelity and the visual appearance, then I am all for it.

Btw, the purpose of making this font,was for creating text on top of an image file used for texturing 3d objects.

You don’t have to make the font with a 4096 UPM size. It’s really a bas idea as some software could have problem. Most of fonts are at 1000 pt in UPM size. It doesn’t affect how crisp is your typeface, all is in vector anyway.
For your question 2, the crispiness of the font depends on how you drew glyphs. It will be needed that you don’t have more points than needed and that you have point at extrema. The way the font look on screen at a size could be tweak adding hints to the font (it’s called hinting) to make sure the vector drawing translate well at a specific size on a pixel grid (the screen). But it’s a really time consuming task as it is needed for each size and it’s only used on Windows as Mac and Linux just don’t bother with hints and use other methods to render type. You won’t have to do that for your font.
You should look at the book designwithfontforge.com and for question 3 look at the Making_Sure_Your_Font_Works page.

Thank you very much for your feedback. :)

Well, hm, I am stumped and I need some help.

Apparently, my font does not have any issues with there lacking a point at 'extrema', however I can't get hinting to work.

The basic concept of 'hinting' is fairly clear to me, and after looking at wikipedia's webpage for hinting, it is clear to me that I want the same effect as seen in the image on the upper right side in that article:
https://en.wikipedia.org/wiki/Font_hinting

In FontForge however, I am unable to intuitively get an idea of how the hinting tools are suppsosed to work and I have not seen anything on the internet that explain it.

Despite fiddling with the hinting options and viewing the font anew in an image editing software, I see no change at all. Apparently I must be doing something wrong, but I have no idea what.

I really would want this to work, otherwise I would be left to correcting a font to look crisp, for every font size I want to use later on, using 'grid fit'. I could deal with maybe two files, but if I wanted a 100 px or 110 px sized font, then I would have to go back and create a new set of the font, which I'd rather avoid.

Edit: Btw, this is the documentation for hinting, in case anyone wanted to have a look: http://fontforge.org/hinting.html

* Goes to check to see if the image editing software has an issue with font hinting.

1) How do I set the EM/point size for the entire font?

You don't set the point size, nor the em size while developing a font: the DTP software that uses the font. You set the UPM grid and that's all. Have a look here: http://learn.scannerlicker.net/2014/07/31/so-how-much-is-an-em/

2) How can I make sure that the glyphs end up looking the best at they possibly can, without them looking inconsistent?

The problem you just posed is a rasterization/hinting problem. For rasterization problems, read this: http://learn.scannerlicker.net/2014/04/16/bezier-curves-and-type-design-...

For hinting problems, you have things like the ADFKO autohint tool (http://www.adobe.com/devnet/opentype/afdko.html), or you can learn manual hinting.

3) What are the basic requirement for finishing a font with FontForge, if only having completed drawing up all the glyphs?

Dinobib got it right with the validation. I'd suggesting staring a lot, proofing a lot.

4) Would the font end up looking more crisp if I made the EM/pointsize large?

No.

You seem to have some design problems with the font, also, like horizontal and vertical lines being the same width, weird curve joints (like B and 8) that can make these to indistinguishable.

Hope I helped!