If your question is whether it is easier to build it on your computer or directly on the site, the answer is that building in on your computer will allow you to work and continously test whithout need to upload on the server and therefore without any problem related to the connection / upload. Also, the scripts on your computer run very fast, because there is no transfer so no delay.
However, unless you have some php/apache knowledge, so that you can setup your computer in a similar way as your web server, the computer installed php versions usually have some different settings that will oblige you to use some commands in order to avoid error messages on your screen.

Once finished, you simply upload everything on the server.

An additional work that you will need to do, unless you also create an installation script: you will have to setup the database and its tables again.

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