Newbie: please advise

Hi,

This is my first time buying a car after months of thinking. I am planning to buy a white toyota avanza 1.3E (A/T).
My primary reason of choosing avanza is to convert this into a taxi after4 or 5 years.
This is my first time to drive kaya A/T ang pinili ko. mas comfortable ako dun kesa M/T.

Kindly also advise on below:
1. Magkano ang max discount na pwede makuha if im going to pay in cash? yung dealer kasi na napagtanungan ko sabi 10k lang daw ang pwede ko makuhang discount plus yung freebies nila like car tint, cover and car care kit. aside from the freebies, meron pa bang pwede mailibre?
2. pwede bang i-convert sa LPG ang A/T? malakas kasi daw sa gas kaya plan ko ipa convert sya sa LPG pag ginawa ko ng taxi ito after 5 years.
3. wala po bang magiging hassle masyado kpag pina convert ko na sa taxi ito?
4. magkano po ang magagastos pagkuha ng taxi franchise if ever iconvert na sya sa taxi?


thank you po sa mga magbibigay ng inputs and suggestions.