Am new to Dreambox , can you answer this questions?

i bought dm920 fbc and its on the way
but am new to linux receivers i have this questions:
1-what the benefits of installing images? like dream elite? or openpli etc..?
2- can i install oscam emu on the original image? dream os?
3- does every image have it own skins? or skin are interchangable? all skin work on all images?
4-how to benefits from fbc? do i need a unicable lnb? if no should i connect two lnb to the receiver?

zeros said:

You get all these questions answered if you try all these images for yourself.
Fbc and unicable, they are complicated. Obviously you need them to learn with the dream original image. Why, because, for example, on a pli this thing is not yet attached and there is a big question mark whether it will ever be there any supported.

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can i install oscam on dream original image ?