Whao, you've done so much to grow the business, lots of hardwork. I think you need professional advice so you can get the real value for your hardwork. I will suggest you talk to a broker. I know that at Selling a business | Buy a business on Businesses For Sale or Businesses For Sale Australia - Buy a business or Sell a business you can advertise your businesses for sale. sometimes its free for some months especially if you are a new advertiser. They also provide broker services but i dont know or cant remember if this is free too. whichever, it wount hurt to contact them.

Its always better to talk to professionals so you can be happy and get your worth at the end of the day

Cheers
Wumi