As you are under 65 years of age, you will be entitled to a personal allowance of £10,000 for the 2014/15 tax year which should be used against your pension as that source of income will be with you for the rest of your life. You will pay tax at 20% on £9,000 of your pension. The tax code should be 1,000L.
The 20% tax band covers the first £31,865 of taxable income so you have £22,865 of that to use against other sources of income before you start paying tax at 40%. So, if you took a job at £25,000 per annum, in a full tax year you would pay tax at 20% on £22,865 and at 40% on £2,135.
If your new job's salary will keep you in the 20% tax band, your tax code for it should be BR (20%). Your new employer should be set up to inform HMRC directly of you as a new employee so you should look out for a tax code in the post. The employer will be notified electronically. You will need to liaise with the payroll section to make sure any new code is correct or you may find yourself underpaid. You may need to contact the tax office on the number here
to make sure that the correct tax code is issued or an incorrect one is amended. You will need to ask your new employer for the PAYE reference before you call the tax office.
I hope this helps but let me know if you have any further questions.