You need to apply ur own tax file number most of the time, edaftar is easy and efiling is easy as well. just go to their website http://www.hasil.gov.my/goindex.php?kump=2...1&unit=4&sequ=1

Regarding the PCB, YA 2011 you dont have to pay any tax therefore they did not deduct your PCB. If i were you, I would not go and apply tax file number for YA 2011, instead i will apply for YA 2012. Because it takes time for them to open a tax file for you, if delay = penalty haha. so better start on 2012 ba by the way, you get your feb salary edi?

As suggested, too rush to get a new file for YA2011 (to declare in 2012), since IRB will be busy with their system, setting up counters, weekend work, etc.

Wait until after June 2012, then go get a new file from LHDN office. Or maybe by that time, your finance/HR already get for you and print on payslip.

Then wait Mar 2013 to declare (using the new file number) for YA2012. In that form, there is a section where you can fill up for past-year un-declared income. So you can fill up Dec-2011 and xxx salary, this (Dec-2011) won't get taxed since just one month income for YA2011.
Also, as suggested, Sdn Bhd is not as simple as Sole Prop. You need to close account, audit sign off, secretary fees, etc. If you can setup a Sdn Bhd, do not save on the ~2k expenses p.a.

look at your statement, normally there will be 2 amount. Principal + interest = RM 1,441. add up all the interest , thats the interest you can claim in relief (MAX RM10k).

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Added on March 1, 2012, 10:49 am

EA form is the name, its your annual income from the company and an evident to show LHDN, so thats your income if the Company apply for you then its good, just make sure to ask them to apply for 2012! meaning your 1st income will be on jan 2012 , so that you can skip 2011 tax return!! O.O
i feel evil haha

if the wife has not work before then you can not elect for join assessment . but nowadays i dun think ppl will join assessment

If you want to do proper tax filing, declare Dec-2011 also.
I can tell you if you get audited deep down, it is so easy to find your income in 2011, e.g. LHDN can ask KWSP for all your EPF contribution 

Monthly PCB +/- RM10-20 or even RM20-100+ is quite normal, especially on the month you receive extra commission, bonus, etc. Just let it be. Submit your tax once a year and you'll get all those numbers sorted out.
Then you can either get back some money from LHDN (over-deduct on PCB) or top-up to pay the tax (under-deduct).
Officially, it follows 1 computer receipt. Choose the more expensive one.
Unless the computer shop is willing to help you on the invoice as 1 PC = RM3,000. 

This year wife not working (YA2012) , will only submit next year 2013.
If you mean your wife not working in 2011 (YA), then do a combined assessment.

Yes, if she starts working again, then can do separate assessment. There is a tickbox in page 1 or 2 of the form.