List of Game Creation Questions

I did a successful prototype for a game and am thinking of actually making it for steam. My game will be played on 12 background images with sprites, and here are a few questions

1- What screen size should I make my game? I need know this for my background images.

1a - Or do you guys make it variable size to fit the screen. If so is there a tutorial on variable screens?

1b - If you make the screen variable size what side do you recommend i make the background images?

2- Would loading all 12 high rez background images into the .exe be bad? Would that stress the memory and/or graphics card? In other words should I load the background pictures as needed?

3 - Is there a way to make character dialogue text appear cool? Like letter by letter, or some other way besides just popping up? If so can you point me to a tutorial, example, or plugin?

4 - For Steam do you use an installer or just a folder with the exe and jpg's if needed.

Thanks

https://www.scirra.com/tutorials/73/sup ... reen-sizes

https://www.scirra.com/blog/112/remembe ... our-memory

*For reference, a desktop pc with dedicated graphics might have 1-2 gigs of video ram, while an integrated chip might have 256 megs. Generally speaking, PCs can also allocate system RAM towards graphical memory, usually 1-2 gigs available there.

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No experience with steam, but usually you want to package your program into an executable. There are third party install packaging programs that do this. You probably want a custom executable icon while you're at it.