For testing purposes, you will need a suite of well-defined smart contracts to use on the IELE testnet. Before you can run your smart contracts on the testnet, you will need to collect test tokens from the IELE Faucet. Please note there is no registration required to use the testnet.
In case you need a refresher on using Remix or smart contracts in general, go through the Coursera course. This is sufficient for you to be able to use the IELE testnet.