Mai bahuta naya hoom

Namasteji, Meri nam Mariah hai. Me hindi sikhna chahti hu...me isme bahot nayi hu

Namasteji, Mera naam Mariah hai. Me hindi sikhna chahti hu, me bahut nayee hu.

Mai bahuta naya hoon

Namasteji, Mera nam Mariah hai. Mujhe hindi sikhani hai, main naya hoon.

Mai bahuta naya hoom

Namasteji, Meri nam Mariah hai. Me hoon sikhana Hindi, me bahuta naya hum.

(Namasteji, Mera naam Mariah hai.  Mein hindi sikhna chahati hun, me bahuta nayi hun.) 

Mai bahuta naya hoom

Namaste ji, Meri ( mera ) naam Mariah hai. me hoon sikhana Hindi ( mujhe hindi sikhna hai ) , me bahuta naya hum ( nayi hun ).     .

mujhe hindi sikhna hai ( not used that often ) - you can also write it as  - "mein hindi sikhna chahati hun "( I want to learn hindi language) . 

please note ," nayi hun " is used with feminine gender , while " naya hun " is used with masculine gender , and its " hun/hoon/हूँ " and not 'hum' .