Welcome to Rcindia family bessi
the material you want to Use is " Coro "
i am a newbie too ... and building my first plane
A beginner or Trainer plane will never Weigh more than 600-700 gm For a foam model and for coro it may be 1 kg at the
most even i thought that to use a motor enough for 2Kg
for a plane most of the things depend on it's weight. (all configurations are inter connected & can be changed as per our needs >> like You already have a Li-Po.)
What i am going to use in my plane are
Motor : Emax1270 kv motor (for 500-800 gm models) = Rs 726
ESC : Mystery 30A. = Rs 850
Propeller : 9*4.7 = Rs 115.6
you can get them in
www.Rcdhamaka.com and
www.rchobbyaddict.com if you need a Transmitter or ARF planes visit
flying--rc.blogspot.com/search/label/ELECTRICS.hope this helps ...
but wait for seniors advice ... The above stated parts are compatible with your Li-Po and available in India
for a 500-800 gm plane .