I am looking to choose my career in the area of decision science or predictive modeling and I am aware that this is kind of opinion based but I would like to have some suggestion from experts that I can use it to build my career in correct path. What are the tools should I know like R, SAS or any other. What are the thinks I should know to work in a data science or machine learning or predictive modeling. For me I am having problem in identifying steps that I should follow. Please suggest me some steps to follow.
First of all I should say you question probably is an off-topic and will be closed soon.
Discussed at this SE site
Anyway I can target you to similar questions discussed at this SE site already:
Cross Validated SE
A set of relevant questions at Cross Validated Stack Exchange:
Data scientist map
This is good infographics of data science knowledge you might need to start a career (Link to image):
Also, simple "data scientist" querying of Careers SE site http://careers.stackoverflow.com/jobs?searchTerm=data+scientist&location= will lead you to the following knowlege "tags":