i would let it get a little stronger, if possible before removing and potting up. the roots are good, but the plant is still really small. once it has 4 or 5 leaves you can gently detach it and pot it like normal, some people use potting soil, some use bark mixes. for now though, mist the roots in the mornings. the main stem if you pot that up may also develop roots and make a new plant as well.