If I do training in plc and scada will it be beneficial for me in future? Where can I get job if doing so?

you have not list your background.

I think it will be benfical and you can work in many industry like:

oil and gas where they are using PLC.

Manufacturing where they control robotic by PLC 

any many others. 

Keep in mind the certification should be accredited by origination where you can apply for vacancy. In addition chose course where the PLC manufacturing you be trained for is used in many companies in your country.