Transaction creation and sending exapmle

import Web3 from 'web3';
import dotenv from 'dotenv';
import util from "ethereumjs-util";
dotenv.config();

const rawTx = {
    from: '0x83757c40420e58135d5881c0c1e30d5424462101',
    gas: 100000,
    to: '0xecA0A3eFCf009519052Dc92306fE821b9c7A32A2',
    value: 2000,
    data: util.bufferToHex(Buffer.from('Hello world!', 'utf8'))
};

const web3 = new Web3(process.env.RPC_LINK);
web3.eth.accounts.wallet.add(process.env.PRIVATE_KEY);

web3.eth.sendTransaction(rawTx).then(console.log);