It appears that you're trying to sort everything out at once, it may be helpful to see the process as a number of distinct steps:
1) Do you meet the immigration criteria?
As Jaj said you need to apply to the ICAA to assess your degree, you will get a letter back stating whether it is sufficient to enrol onto the program (and whether it is enough to meet the immigration criteria). Based on your 8 years experience, this should be sufficient (please be aware i am not a professional advisor so don't just take my word for it).
2) Will you be able to get a job?
This does very much depends on your experience, either way you need to expect to take a lower position then in which you're working in now and pretty much "start from scratch" and work your way up.
There are many highly qualified individuals migrating to Australia, especially from Britain (whose qualifications are recognised in Australia), you will therefore be faced with high levels of competition.
Do ask yourself the question whether your reasons for your move to Australia outweigh the “cost”, whether it will be worth giving up everything you have build up in the Philippines and start from the bottom.
Many who come to Australia are very happy, others are very disappointed, its not a paradise where things "magically" just work out. It will require lots lots and lots of motivation to get through all your struggles and it will definitely take a lot of time.
3) Long term career progression.
Once you found a job, i would advice to enrol onto the ICAA program, exams will take approximately 1.5 - 2 yrs, the work experience requirement is 3 yrs. After completion of the qualification, job prospects are very good (and the salary level will rise accordingly).
So if you're serious about migrating, be prepared to take a 3 year step back in your career and view the migrating process as a long-term project which goes beyond the mere formalities of obtaining the visa.
I hope i could be of any use
Wishing you good luck!