@sandeep , if you are interested in browsing few sites , e-mail &
simple chat then BSNL 256 startup plan should be sufficient .
if you need downloading & serious surfing the net then you would
require BSNL Home 500 plan .
if you need always on net connection & use internet in your daily
work routine then you can take BSNL unlimited 900 or 900 plus .
if you need regular uploading then you have to go for airtel
unlimited plan .
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you can purchase the
ADSL modem from the market (if you have
not purchased from BSNL) . you have to take any good brand
(NOT
Huawei) with warranty .
The type of the modem depends on your requirements .
if you just want to connect a Desktop PC then ADSL modem
with a LAN port ( & a USB port - optional ) is required .