Yes you can defer your courses for that duration of time but pls go through the college detailing reasons why to put the college in your situation and to make it official-they can always defend you incase
Provided the visa is still valid,you dont have to apply for another one and once in college you can apply to extend for that duration you missed and international students department are so good in this.For now you can still use the one you have provided still valid.
Why take semester fees and you are not attending classes,for what? You dont have to pay semester fees but pay enrolment deposit which shall be acredited towards your fees-this also helps to secure your spot when you finally get to attend the college
Hope this helps