how am I suppose to type the correct word in hebrew when I have a english computer?
Install the Hebrew keyboard, obviously. Most likely, the Hebrew layout is already installed, and you just need to turn it on in settings.
You can also use a virtual keyboard, such as: http://gate2home.com/Hebrew-Keyboard
So to make it clear- ה serves as 'the'?
Google provide a virtual keyboard
I wrote אבא it says correct, the longer 4 letter version is also ok. What is the difference please?