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Is there a particular heatsink you have in mind? Or should I just google it?

I thought, somewhat, the module made up for the lack of a heatsink? The last laser I built didn't have one, I don't think, and I could leave it on for a few minutes at a time... but this'll be more powerful, won't it? What specific part would be suggested, then? Also, for the static, I assume...

Diode 660nm 300 400mW CW Red Laser Diode ML101U29 25 1pcs Pak | eBay Driver Survival Laser Driver Module Copper 5.6mm diode mount for AixiZ 12x30 case, AixiZ Batteries https://solarbotics.com/product/17020/ Goggles Eagle Pair® 190-400nm & 580-760nm Laser Safety Goggles With...

For the lulz, I might try and cut it out in a gun-shape, and put a button where the trigger would go, but let's not get ahead of ourselves.

I was kind of planning on just mounting everything to a piece of wood, letting me look at or edit the components easily, see if anything broke, etc. So, if I wanted to, I could purchase all the stated items, get the tools, and build a 300-400 mw red burning laser, right?

What does the host actually do?

Diode, check. Driver, check. Module, check. Wiring, check. Batteries, check. Heatsink, check. Safety goggles, check. Anything else?

What kind of heatsink would work best for the diode and other things stated so far? Any particular item I should buy?

Diode, check. Driver, check. Module, check. Wiring, I have some laying around which I've used for other things, works great even with pretty high voltage, check. Batteries, check. Heatsink and host, I thought were decided to be unnecessary? Correct me if I'm wrong, please. What do I do about the...

Anything else is more money out of pocket, which isn't going to the laser itself, and I could just use a vice in school, so why spend? Just so I've got this down pat, with a soldering iron, the stated diode, the stated driver, and the 5.6 Aixiz module, I can get this to work with 3 AA batteries...

I could probably ask my school if I could use a vice in the woodworking room

So, with say a 2 AA battery pack and the two things you said, it becomes a matter of just building it, right?

With that diode and that driver, what else would I need by way of parts to get it to work?

Survival Laser Driver Would this work for the driver?

660nm 300 400mW CW Red Laser Diode ML101U29 25 1pcs Pak | eBay Would that work well as the diode? If so, what would I need to attach to it in order to make it work?

I think, for my first few builds, that doing anything that complex or dangerous would be inadvisable... is there a particular diode or module that it's suggested I try starting with?

I think I have a printer that is basically trash, and I think my mom's old desktop's disk drive is capable of writing, I think... would either of those work?

Just a small driver and diode... or, what would you suggest? I want to keep everything pretty cheap, but I'd also like to get quite some power out of it. What should I do?

Without purchasing anything too fancy, how would I go about cooling it? I'm not planning on running it for hours on end, but for maybe up to a minute or two at a time?

Would it be practical and safe to take an altoids tin, punch holes in it for the wires and stuff, and mount everything into it? It's what I did last time, and Styropyro did it, but is it actually okay to do? After I get it working, I might take a crack at attaching it to something, but not...