what i heard from my friend (i'm a beginner myself) start with cheap and small plane/heli electric heli first.but good radio can be good
for heli, go for v911 micro electric heli..don't go those big electric/fuel heli first coz the blades are strong and fast, can chop off your fingers very easily
not sure for plane tho..

with a budget of 4-5k ... u can start with a good radio ... highly recommend the futaba 8FG ~ 1.3k
then decide on your choice of helis

within your budget
u can either buy new or 2nd hand ... IC powered or electric

bigger is better coz its is less sensitive and handles wind better
bigger is oso much more expensive ... unless u go the IC way
IC = internal combustion .. u will need to know how to tune the engine well in order for it to operate well
bad tuning normally results in poor power and engine shut down during flight

i myself is an electric guy so cannot help u in the IC dept ...
electric is just plug and play
but batteries has higher cost in the long run

your remaining 2k+ ... (if u choose to go the electric way)
i would choose either a 450 size to be cost effective
a decent 450 would be slightly less than 1k
300-400 for budget batts and charger (high end chargers cost much more)
scale body apprx 300-700 depending on your choice
thats almost 2k spent

since u are starting from nothing ... and no RC experience with helis
i suggest u keep the remaining balance of your budget for repairs and parts

get a simulator to practice ... this way u can learn alot while crashing less
then practice and practice more
when u feel confident enuff ... put the scale body onto the heli

good luck !!!

wow ianya sagat hebat!!! hahahaha,
QIW tomorrow fly where?