hello,
I am new to RC and I want to buy a new transmitter and receiver set.So can anyone please suggest me one which is low in cost.
thank you.

your budget???

Rs2500

u can get 4 channel fly sky tx rx i would prefer u go for atleast 6 channel cause 4 channel is = ailerons ,elevator,rudder,throttle u cant use flaps or light system or any other aux... and u can't use 2 seperate aileron servo connection u have to use Y cable with servo signal reverser...so its better to go for 6 channel..it will be difficult to get in india but u can try..
enjoy

got good news
flysky ct6b is available on ebay for 2.7k (it is second hand)buy it its a good deal and flysky is best for beginners i myself use flyfky th-9x and i am also a beginner
link-fly sky ct6b

You can take RCB 7x for Rs. 3400/- incl. Shipping
http://www.rcindia.org/for-sale/avionic-rcb7x-for-sale-%287ch-tx-with-7ch-rx-and-wireless-simulator%29/msg147277/#new
Moreover it has wireless simulator which you can use for practicing.
It has wireless trainer option, i. e. if you purchase another similar one, you can use it for fully wireless trainer as master and slave Txs.
It has several mixing option so that you can make V-tail, Ailevon etc. etc. mix very easy.

Where can i buy a 6ch rx and tx in Delhi?