2d animations in unity, no ad-ons

i made my sprites in flash and i made a texture and made one 2d picture with a really thin cube because the plane didn’t work that well with rigidbodies, so how do i make 2d in unity? also does anyone know how to flip an object horizontally, like in flash you just do -100 or -1 xscale, how do i do that in unity?
i use javascript,
thanks.

I use a combination of things.

SM2 - Sprite Manager 2, from AnbSoft is a great little too to allow you to create 2D animations, pack atlas’ etc. There are tons of others in the asset store. Check it out.

To flip an object I use transform.localScale.x = transform.localScale.x * -1

And for rigidbodies, use cubes, spheres or capsules.