What API keys of altcoin clone use to create web wallet and web ICO

[linz]

I successfully clone litecoin but I not know how to use its API keys to launch on ICO page and create web wallet.
example
npm install bitcoin-core
and import this
call its method (getbalance etc..)
but how use for clone coin if want to sell this clone coin on ICO page.
client will buy some amount and need to send altcoin by  instance to user.
Is this web wallet function use in ICO page.
does any tutorial about this process.
on Internet, most are ethereum token tutorials.
I not interest token.
but rare altcoin tutorial
can someone guide me.

[NotATether]

bitcoind-rpc npm package is much better than bitcoin-core if all you're trying to do is make RPC calls. It works like a charm.

But since that's not your goal, you can't really make an altcoin without some idea of what parameters and consensus rules you want to change. You can't just "make" an altcoin out of thin air.