Don’t fret it mate, those aren’t elementary questions, your learning. ??
1. Well, since you are already on a domain you would have a sub-domain like this: blog.yourdomain.com OR yourdomain.com/blog
The ‘blog’ name can be changed to anything you want such as ‘personalblog’ or ‘news’, etc..
Or if you add another domain, you can just a public_html installation in the root of the domain folder and just access the blog from: yourdomain.com
2. You can just post a link on your website to your blog. In your navigation or footer or anywhere. Just name it ‘blog’, ‘personalblog’ or any name you want.
Then people will be re-directed to your blog from your website.
Hope that helped mate. ??