luk , the doubts u have r very obvious,
about body shapes, there are a lot of body shapes in guitars,
dreadnought, jumbo, mini jumbo ,grand jumbo, grand auditorium etc..
the most popular shapes are dreadnought and jumbo shapes
i'll recommend u a jumbo shape since it has a lot of tonal balance,
a jumbo has the lower bout and the upper bout of equal thickness,
while in dreadnought the lower one is larger than the upper,
also dreadnoughts are more bassy than jumbo's and also much louder.
go 4 a grand auditorium or jumbo.
finishes hardly make a diffrence to a beginner ,choose any one,it is the tone which matters, after u get ur hands on this guitar for about 1 year then u can buy ur second guitar with gud luks etc, right now be simple and plain,
one imp thing i must tell u is the wood ,guitar have 2 types of top(top is the portion which bears the sound hole) - solid and laminated. solid wood meand real plank of one type of wood, while laminated is just a fancy name for ply wood.
if ur going 4 a local brand then definitely they r all plywood guitars.
but if u go 4 a higher range go 4 a solid top.
there r various types of wood cedar maghony etc...
but newbies don't nees so much information just buy what sounds gud.
i recommend u go 4 a pluto or yamaha , both of them have solid tops and r trustworthy, gud performance guitars