Hi Karol,
I would strongly recommend using wordpress- very user friendly. I work for a small web design agency and this is what we use
when developing all our client websites. Our website is also done with Wordpress, take a look: www.mooveagency.com
Also if you read our blog on there it will tell you about the main benefits of using Wordpress.
Best of Luck!
Maria
Social media strategist
Moove agency