yeah, you can just put it on a 24 hour or a 20 and 4 cycle to put it back into vegging. Thats basically how you clone the first time if you are not sure of the sex. you wait for it to show it sex and if it a girl you put her back on the vegging cycle. About a grow box there are lots of thread you can look at just do a search on diy grow boxes.
I used some shitty clone powder i got from lowes a while back. Its very tuff to clone a flowering plant but it totally can be done. each strain/plant takes cloning differently.