Would this mean if I create the coin under ETH network, that would solve the issue? To create our company coin, how much would we need to pay in ETH to get it created and handle our transaction.
Making a token under ETH or WAVES network would solve some of your problems, but not all of them.
My experience with ETH is limited, but I know for sure that making a token under WAVES network is very cheap.
The only drawback is that at least of WAVES network everybody's wallets will need some WAVES too to pay the transaction fees (again, it's tiny amounts).
2nd) Is it possible to fork out address for our company investor so they can have their own wallet, I know bitcoin could do it, but not sure if its the same for ETH.
I'm sorry, I don't understand your question. I don't know what would you mean by forking an address.
Your company will have an address with the tokens, your customers will have their wallets, each customer will have at least one address that they'll send to you (subscribe), you will send your tokens to those addresses.
And if you will list your coins at a public exchange, everybody will be able to buy them if somebody sells. On WAVES you can use the decentralized exchange, it may be easier than discussing with exchanges.
If you want to avoid public access, you'll have to make your own exchange.
If you want to avoid tx fees, public access and so on, you better hire somebody to make your private coin, private blockchain and private exchange.
I also feel like your understanding on cryptocurrencies also needs a boost (no offense intended).
Now your last points:
What we need is to
1) Create a wallet for each investor (we got over 1000 investors currently)
No. Each person creates his own wallet and subscribes to your service. The wallet is something private and has to stay safe.
2) Put coin into their wallet (Hope to achieve this through CLI command)
No. You don't "put" coins, you transfer them. Pay for the transfer and wait for the network/chain to process it.
This is why it's important to understand if you want a stand-alone coin or a token; this is why you have to think on how you want to process the transactions or leave others to process them.
3) They are able to sell this coin in exchange we are listed in
4) We buy back their coin using BTC or ETH.
If the exchange is public, anybody having BTC or ETH can buy, is this okay?
You can use in some cases DEx, skipping the "bribe the exchange" step.
I hope this helped for a better view.