A Startup is an aggressive business, and I think in modern terms it is something which is bridging a gap in the market. Regular traditional businesses are not considered in startups nowadays especially as per the definition of investors because normal business can not achieve huge growth as expected of a startup.
Website is something which is showing the information of an entity it can be a nonprofit organization or a business, so a website is not a business in itself as a startup.
I checked your link of BetaPage and I think it is more like a startup
contact to active hunters who frequently post the product and request them to post your product they will surely do it because some hunters post around 2 to 3 products every day. They also admire good products and they will make you maker you will get your own invites.
Yes try betapage.co, betalist.com, launchingnext.com,betabound.com and producthunt.com, please note betalist.com is paid but rest of the platform are free
Never waste your time to make the product perfect, Always follow the steps of lean startup. Launch MVP (minimum value product) first and that too don't launch directly. firstly beta launch it. there are many platforms which will provide you the beta testers and early adopters.
Trust me once you beta launch your product early adopters will give you many useful tips and most important the subscribe button and review of early adopters will give the idea that whether your product is needed in the market and upto what extent and what changes needs to be done
There review will help you to determine the direction of development and they can even help you to determine the reasonable cost of the product(if you ask them for it)
I have made this mistake so please never spent countless hours in development just because you think its needed in the market take the review and idea validation from experts.
An Entrepreneur needs to learn a lot, while I always believe that an experienced person can always conduct a better business than a fresh one but learning mostly depends on these 2 things instead of size of organisation.
(1) Your Role in organisation : you should be at the place where you get enough exposure to learn new things
(2) Your desire to learn : The person who is happy in a 9 to 5 job can never learn the things which don't fall in his/her JD so if you really want to become a good entrepreneur, you should be ready to do as much work as you can do to learn new things
If you are asking about the general books then the one which has been relevant from 5000 years and will always be relevant in future also is Bhagwat Gita
Website is something which is showing the information of an entity it can be a nonprofit organization or a business, so a website is not a business in itself as a startup. I checked your link of BetaPage and I think it is more like a startup