Thanks a lot everyone for the feedback.

1. I can't use coinbase as its not available in Pakistan
2. Most of the exchanges mentioned like bittrex and binance don't have all the altcoins available
3. Cryptopia seems to have the largest number of coins but I find it strange that one has to buy them with Doge coin? Like first I've to deposit money there then convert it to Doge then buy the alts with doge. Once am done then again convert altcoin to doge and then convert it to NZ$. What a long and stupid process IMHO if that's how its seriously working.

ps. novaexchange registration seems closed...