Does anyone know if there is a standard set of rules for choreography or is it set differently by each competition?
If there is a standard does anyone know what it is?

There is a standard, printed in the SOBHD Rules/Constitution booklet (your teacher probably has a copy). However, individual competitions may add their own requirements (e.g., theme of dance, specific music, etc.), so you should also check with the particular competition rather than just assuming the general rules apply.