can you share any format availble with you
I don't want to actually post the template, as it is part of my consulting work. I assume there are various Aspect list examples posted on Elsmar.
However, if you follow what I described, in 14001, there is a column for Aspects, where you describe the various aspects of your company and what you do. That same column can be used to describe the hazards in your company.
There is a column for Impacts in 14001, that can also be used for Risks. The rankings and scoring can be the same also.
Now, if you are just beginning, and really do not have much knowledge about ISO 14001 and OHSAS 18001, then I think you need a different approach. I would advise first you must read both standards. Maybe use a good consultant for a short time just to get you started in the right direction. Then you can take it from there. You may contact me by private message if you have more specific questions.