superstar2k9

Hi i am an amature when it comes to building websites, well i have the design part down but its more so the setting it up part where i run into trouble.

So a few questions i have

Im using dreamweaver and when i create a page, ie. home page title home.php

Q1 At no point have i givin this page or anyother page an actual url. So my question is . when someone types my address into the address bar eg. www.mywebsite.com or whatever how are people directed to the home.php page and the same goes for when i link a tab such as contact tab is linking to contact.php or do i have to actually name the pages www.sitename.com/home for example please help me understand as i said im new to this????????? .

Q2 i have created all my pages in .php form but do i need an .html copy for ever page when i upload everything?

Q3 This is for anyone using DreamWeaver cs3.
At one point while editing in DW when i click to preview in browser the page opens as always but i was able to click a link or tab on the page i opened in the browser and it would instantly bring that page up in the browser but for some reason now it is brining up a save/open or cancel box asking me to select one of the three even if i click save or open, the browser will not display the page i have asked for anymore, even though the pages are all saved. Anyway is there a setting or something that i have changed .

Many thanks to the person who replies and i will thank you again for your help.