[Snowflakian]

I use random paints, mostly model ones.

Testor's Acrylic, Masterworks, and even deck paint. Any hobby place, or even Home Depot should have some. Krylon and Dupant work so far the best that I've done, but they take near weeks to dry. But once they do, they are like the plastic itself, they are that durable. But those should only be used as a last resort if you can. I had to do that for the iron patriot I'm working on, and it's murder waiting for him to harden so finger prints don't sink in as I handle him to do the rest. But once it was dry, that stuff won't even scrape off.

Another thing to keep in mind is how the paints are based themself. Like Jin Saotome and others use Tamiya water based paints, among more. But with paint that's water soluable, even the skin oils in your hands will make it fade and rub off over time unless you seal coat it. So that's something you need to think ahead on and be prepared for. Water Soluables are great for beginners due to their ease of clean up, but you must remember to coat it with a finishing coat once you are done to prevent fade, rub off, etc issues. As great as these are for beginners, if you aren't used to their problem aspects, you'll be repainting the figure every few times you handle it. Jin Saotome gets around this by finish coating it, that seals his work in place for moderate durability.

As for straight lines, tape and patience is your friend.
Start off slow, pick one color to do at a time, and tape off the areas that don't get that color. Paint what you need to. Let sit for a day to a day and a half to make sure no smudging while you handle it to tape up the next part. Remove the tape after it completely dries and hardens depending on the paint used. Tape up the next spot for a color, and repeat. Also remember before doing this, pick the one major color you'll be using, and do it first.

For example, with spiderwoman, cover the eyes and if need be the lower face. Use tape and an exacto blade to make sure it perfectly matches the area you need to cover, then paint her the base red first. Then once that dries, tape off the spots needed for the next color like yellow, paint that, let it dry. Then do the black borderlines using the tape on both the yellow and the red cut to shape as you did with the eyes. Or you can do the black before the yellow to make the outlines easier on yourself, but sometimes it's hard for light colors to show up as intended on black, but not vice versa.

Another great thing to help in this taking the figure apart, and handling each piece one at a time using various tools that can hold it in place for you and steady while you paint, so you can leave it as that till dry. I have a stand that I inherited from my father that does this for me with clips. But others I've seen have used toothpicks, styrofoam, nondrying clay, and more. I've even seen one person use sticky tack with toothpicks to hold pieces, while the they were placed in styrofoam to hold them steady.

Another thing that comes in handy are ROC scarlett reactive suit hands. They have the same dainty feeling as the Ms. Marvel Hands, and give you more variety to your figures.

The yellow I recommend on Drew, is Masterworks 4771 Gloss yellow.
You'll also need a gloss red, no clue on it's number designation but you may want to compare at a hobby store till you find the rich gloss red you need, and you also may want to get two blacks. One flat for the hair, one gloss like for the black lines.

A key thing to help with figures especially, Flats for skin tones and hair, gloss for clothes.
Unless you want to go for pure realism, then stick to only flats. I tend to like to mix it up with gloss and flats though, to give the costumes that extra sheen but leaves skintones that more human looking flat color unless you need some kind of 'glow' to the figure.

Another trick that I use, is ahead of time going through the various model paint websites to find the color I want. So I know the number designation ahead of time before going shopping. Makes finding the color quicker.

But honestly the first thing you have to decide on is, gloss or flat. Then pick your colors accordingly. Also be sure to buy paint thinner and at walmart they have a brush set that's about 3 dollars, each handle is triangled off for easier holding, and they have a multitude of sizes in the pack to cover almost all needs, with a soft enough brush hair that you won't get weird paint marks or gathering spots.