We have written an in-depth guide on how to get started with cricket betting online. You can read it in full here: how to bet on cricket
How to Bet on Cricket - the Quick Version:
Create an e-wallet account (~5 minutes)
Send money to the e-wallet account (~1-3 days)
Create an account at Bet365 (or another trusted bookmaker) (~10 minutes)
Deposit funds from e-wallet to Bet365 (~2 minutes)
Place your bets at Bet365
There are plenty of variations to this method where you can use other deposit options, choose other betting sites and so on, but the basic process is the same for whatever way you choose to get setup.