I have make new blog on that website which url like domainname.com/blog/ so Its essential to make new xml sitemap for that blog and have to submit in Google webmaster tool ?
I don't think you need to make a sitemap for the blog..if you want to get it cached faster submit in blog directories
I would use a new sitemap located in /folder/ if you have 2 sitemaps located in different folders it's all good.
Its simple, you have to drag text widget in your menu areas and paste your adsense code but adsense couldn't be applied on free wordpress hosting
If you have used the wordpress for blog then you do not need to create sitemap.xml file by your own. You can install sitemap plugin and it will create the siremap automatically and will update it as you post new blog posts.
I think the opposite. You should have a sitemap in your blog, as soon as you configure your posts and pages as 'dofollow' in your html code as well as in your robots.txt file.
If you are using wordpress for blogging then they already have a internal tool that you can download (plugin) that will generate sitemap. Use permalinks wherever it is possible.
i dont think sitemap is important in blog you must submit your blog to blog directories and bookmarking your post
If your blog is built on wordpress software, the xml sitemap plugin is absolutely perfect. I think sitemaps are an important part of any website and Googles webmaster tools provides you with some really useful information like... - How many webpages you have indexed with google. - What search terms your site is ranking for in google. - How many links google has recognised that point to your site etc, etc. Some very useful stuff for a website owner or webmaster.
i dont think you need a sitemap just do bookmarking and submit your blog to various blog directories and your post would be indexed by search engine
If you use WordPress for blogs, then they have an internal tool that can download (plugin) that will generate the site map. Permalinks use wherever possible.