New Polaroid SX-70 camera!

I was so happy when the mailman brought my new camera today....
To put the 600 film i have in the SX-70 camera, i only cut the little plastic pieces off and the film fitted immediately.
Unfortunatly, when i made the first picture, there was way too much light in it.
I don't know what to do now, to make this better.



Some examples of polaroids SX-70 i hope i can some day achieve!


(.)


(.)


(.)


(.)


(.)


(.)

Does anyone have any tips or tricks for me, how i can reduce the light in the pictures or other things i could do to make beautiful pictures with this camera and 600 film?
I'd really appreciate!