Iam from bangladesh.i've completed hsc.now i want to study interiordesign course in japan.how i will apply?

i want to study in a japanese university.my choiced subject is interiordesign/fashiondesign.so how i will apply for the student visa and how i will select the university?what about the cost of japanese uni?shall i get the oppurtunity to do any job during the study time?is it essential to know the japanese language if i want to study in japan?if yes then i have to do the language course before joining the selected subject,isn't it?