I wanted to now what is the molecular geometry of SeBr4, because I believe is a trigonal bipyramid...but I am not sure...please help me....

I thought it was a see-saw shape. See

http://www.stolaf.edu/depts/chemistry/mo/struc/explore.htm

You can see SeF4, the shape of SeBr4 is similar, but the angles are 120/90 deg as I recall. Nearly same shape

I think both of you are correct. SF4 is AB4U (5 domains) and is trigonal bipyramidal for the electronic geometry and see-saw for molecular geometry. SeBr4 should be the same.