Dear Ravindra Ingale,
First you need to get IEC code number from the DGFT office.Its a 10 digit unique code number of your product.u have to fill an online form on the DGFT website.its around 500 rupees.
After that you need to register under RCMC of india.
These 2 things are manditory to start any export bussiness.
Then study on net where are oranges exported mostly .to which countries are they exported.??ALL this information you will get on Infodrive india website.
After you fix the country where you wish to export your product,search for buyer in that country.
Buyers can be found on varies sites like chamber of commerece,trade fairs,magazines,Commerce india.
Ask the buyer if he wish to a free sample or E Sample.send him samples.
u do not need to worry about documentations.there are consultancies that will help you at every stage of your process.
Please do reply me if you need any further details.
09822724129