I want the detials of Basic Package, is there any offer on that?
You can see the details of all packages in the website Control Panel -> $ Paid services -> Paid services. The Basic package does not include the possibility to use PHP scripts. I also suggest that you read the following thread: http://forum.ucoz.com/forum/37-13078-1
What about Subscription fee for the E-shop module? what is the benefit of this functionality?
It's a paid e-commerce module, if you want to sell goods via your website - you can use it.
I already have a domain which is redirecting to my free website (created on Ucoz). How can i merge both domains?
You can attach it to your website. One AdSense can be used for different domains, so there shouldn't be any problems.
I'm not active on the forum anymore. Please contact other forum staff.