How does one asses the impact of a proposed policy?
Being an economist, I'd say that carrying out a quantitative forecast ("the policy will create/cost x jobs") would require setting up a model, feeding appropriate data and applying appropriate estimations. You would require decent data on the firm level and a detailed model dealing with lots of production factors. In other words, lots of work and probably way beyond your team's resources. 
What might be feasible is to do a research on the relevant scientific literature in that realm. In particular, you should look for theoretical work on the expected qualitative effects from such a policy. Second, you may look for empirical studies on comparable policies in other countries and contexts. This might give you a rough picture of what one can expect. Assessing the external empirical results might be hard if you're not an expert in the field, but the following guidelines might be of help:


Prefer authors from academic institutions over e.g. international organizations or (way worse) lobby groups.
Prefer peer-reviewed publications to non peer-reviewed publications. Use Google Scholar as search engine. For any research item, click on "all versions". If the item is published in some scientific journal (say, Journal of Environmental Economics), this might give you an indication for quality.
prefer more recent studies and studies that deal with countries similiar to yours over others.