For your height & weight, and Brewer Nose Rider could be a good starting point.
http://www.surftechaustralia.com.au/brewer-longboards9'6 x 23 x 3 and a bit.
Where are you located? I also have a Billy Hamilton Hyperform. 2nd hand Surftech could be a good starting point. They are durable and tough, which is good when you are starting... You will learn though you mistakes... You will drop a slippery board, and you might even lose control in the wind as you put it on the roof... You'll knock it on stairs and handrails... Surftech Tufflite boards are your friend in this learning stage!