POST methods, should I implement rest of the methods of the
http such as
The website is about a small business site, all I'm worry is about search engines and indexing.
Thanks in advance.
I doubt you'll need another. I make websites for a living, and I never use HEAD (starting to wonder if I should look into that ;) ).
For a small bussiness, this will do perfectly fine. I hardly run into problems on default configured servers for normal websites.
Searchengines and indexing is content-related. Make sure you have the proper texts/stories/content, with proper html (H1 for title, p for text) etc and you have the basics of seo covered. SEO has little to do with the methods you use to send data.