I've had pretty good results previously with SmartIP, and now there is Rules integration which can react to which country the user is in.
So you should be able to set a Rule similar to the following psuedo-rule:
Page is going to be viewed
- Page is: Front page
- IP Address is in country: whatever country you want
Go to page: YOUR COUNTRY SPECIFIC LANDING PAGE
I know you said you were new to Drupal, so you can find some really useful Rules tutorials at NodeOne: Learn the Rules Framework.
I've just twigged you said you want it to the province level rather than country (sorry, that was glaringly obvious - my fault), so you might be looking at some custom code.
Last time I used it, I used SmartIP to get the latitude and longitude of the user, and then the Location API for the nitty gritty.
You should be able to combine this with
drupal_goto() to redirect the user to the relevant page.