Your Nuls investment is yet another, build your blockchain on our blockchain style application. While I have no doubt whether businesses and even individuals will want to start building their own applications on the blockchain, the question is which startup will be the one that achieves mainstream adoption.
On this front, I'm not sure this token has what it takes to compete. They don't really have anything that sets them apart, except for the fact that they will allow you to use your tokens to host master nodes for passive income, which could be attractive to some investors.
I feel their lack of ease of use features, and the absence of the ability to host private chains will hinder them in comparison to other providers of similar services. Read on to see why I favor other platforms offering similar technologies over this one.
There are many exchanges where you can buy Nuls, this includes at least one top 5 option. While Bitcoin is the highest volume trading pair, there is also substantial liquidity for Ethereum traders as well. You should be able to easily complete a trade, at a fair price for either of these pairings.
This is an ERC20 token, and so you can keep them in any wallet that offers support for Ethereum assets. There are lots of good choices here, and there aren't really any incorrect options, other than keeping your coins on an exchange, which you should never do for the security of your investment. If you need a few suggestions then you can try My Ether Wallet, Meta Mask or Coinomi mobile wallet for ios or Android phones.