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So I've decided that I'm going to try to get my models to look more decent. Currently they only have on coat on them (not including the primer). I mainly want to add more detail to my models. Do I just paint over them (with better techniques of course) or should I strip the paint? If I need to strip the paint, how do I strip the paint?

A picture always helps. It depends on several factors, how much has your technique improved? Was the base layer done with thick paint? Hastily? Are the figures worn from gaming/handling?

I use purple power to strip any plastic, resin, metal.

Here's some pics.

My computer is acting funky so I'm posting these pics separately

And again

Last one.

That doesn't look so thick that you couldn't just paint over it. Maybe sand the vehicle with very fine grit paper in a few places where paint had built up.

These are some examples. I'm trying to improve my painting skill in general, so I looked up how to paint online, which was why I was wondering. Will it be tough to improve the painting on these?

Do you mean to adjust what's there already, or start with entirely new paint schemes?
I wouldn't say tough as long as you are patient. Neatening up and laying down base colours is dull but it's certainly achievable. Then your details, etc are the harder part.

They look like they can take another few layers without losign detail, Paint-stripping takes a fair bit of effort and time -I would reserve it for models which have had thick coats of paint slapped on them and have therefore lost detail. For something which has just been basecoated, I'd leave it and just paint from the basecoat (assuming it's a colour that suits and has been applied correctly.

If you are paint stripping, the most common approach is to immerse the models in a solution of Dettol for at least 24 hours, then take out and scrub with a toothbrush. Wirebrushes, sandpaper, precision blades, screwdrivers, toothpicks and small sharpened brances are all very useful to have on hand, becasue some of the paint in the recesses and detailed areas will be very stubborn to come off. Even then the model may require one or 2 more immersions and scrubs before you have it to an acceptable quality. Results are better on vehicles because the large flat surfaces are much easier to remove paint from.

Fairy Power Spray is a favourite of mine. Although its not the strongest paint stripper, it's effective on both plastic, metal and resin / finecast with no risk of damage. There are more powerful solutions available that will yield faster results, like nail polish remover, and brake cleaning fluid, but carefuly check their effects in various materials before subjecting your models to a possibly destructive bath. There are one or w threads here on Dakka discussing various solutions. I'll send you the link if I can find it.

I want to sharpen up some (the ones with the desert and olive drab) and repaint the bright blue ones. The bright blue ones don't even have primer, they just have that one blue layer and that's it.

I would highly suggest strip now that I've seen the pics, there are visibly mold lines on the fusion gun of the crisis, no amount of paint will hide that. The highest standard of painting will be ruined if the model isn't prepped right.

prepping= cleaning mold lines, magnetizing, pinning, drilling gun barrels, green stuff bubble/gaps, assemble in stages to avoid undercuts for easy painting. I spend as much time prepping as painting.

I'm with Big Mac. You can see the mold line on the top of the gun of the first model -- it's glaring.

I assume you don't have a big commercial ultrasonic cleaner to leave them in for an hour or two, so I'd go for Dettol + electric toothbrush stripping