Cars Q&A

i want to buy used car and my budget is Rs 1 80000 to 1 lakh.. i am very keen on buying a big car thats a sedan.. i do not know lot abt cars.. what should be kept in mind when buying second hand sedan also the used car prices that the seller show on website are they rea. and thats all that i have to pay or are there any other hidden costs?? what is the procedure of buying a used car? how do i go about it? pls help