hoodie

Hi, I have a few questions about you guys, because i’ve been thinking to start my own clothing brand.
Are you able to mix materials like cotton and polyester together? Like if I wanted a hoodie that is made of 50% cotton and 50% polyester?
Are you able to make tag logo in the neck like all brands have? How much are your products? And Can I get samples before I buy a lot of clothes?
Thank you for your time
Best regards Nikolai