Hello, I wanna buy domain but i am a bit confuse thus on the site i want to add blog also start Opt-in & the site will be static do i just need one domain name for all this ? or different names ? cause i want them all to be together .
Yoursite.com/blog/ or blog.yoursite.com When you say "different names" maybe you mean to different domains ) , you only need one , and good ( simple etc. ).
Is better to lose the time with one site . Or you want to divide your time with a few sites? If you divide your time with a few sites, will be dificult for your. Is better to lose your time with one domain , and of course you can create subdomains , to have more sites ( but like this you'll don't divide your visites ).
You can have a blog and an opt-in and a static frontpage all on one domain. You can even create subdomains or subfolders, should you need it (f.e. your homepage is on mydomain.com and your salespage would be on mydomain.com/salespage etc.) I hope that answers your question!