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Three things you can do: search WebmasterWorld on the topic of HTML editors; search the internet; or search ebay. There are many points of view on WYSIWYG editors and I do not even want to open that can of worms. But there are many good free editors (depending on skill level) and many resources such as www.w3.org (though it's difficult to follow, IMHO) and www.w3schools.com. I am sure that there are other people who can provide even more information than I have. Regardless, welcome to WebmasterWorld and good luck.
There's lots of info in here on all the stuff you need to know but if your time is valuable you would be better considering hiring someone to do this for you. Your site will be ready more quickly and it will almost certainly look more professional. It's not easy for an amateur to build a successful business website. I get enquiries every other day from people who have rolled their own and a year or two down the line they are wondering why no one is visiting them.