How to replace my old wesite with a new one built using WAMP

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My current site is live and is is hosted by 1 2 1.com. I now need to replace this site with the new one i have built, the domain name is staying the same, i hope this information helps.

Is the content same for both?

we run a craft supply company so the content is basically the same (product etc) but the layout, theme and design is totally different

Ok, backup the present site

.zip the wp-content and extract to the present one..

I think this may be beyond my level of expertise, i only have a basic knowledge of this subject

ok, you can do one thing..

Compress your this theme and upload it in your present theme?

i have no idea how to do this

What I can do then bro?