Below you will find several tutorial videos, which might help you with creating account with Coinbase, connecting your bank account and credit card and buying your first Bitcoins. The below videos is describing Coinbase account for US customers. It is slightly different from country to country, however the differences are rather small then anything major. Coinbase itself is also intuitive, so you should not have any major problems.
Creating of Coinbase Wallet
How to Connect Coinbase to your Bank Account - US customers
How to buy Bitcoins with Coinbase