Lenovo p70

Hey!

Newb here! I just got Lenovo p70 for the sake of battery and low price tbh. And i realized i just hate custom the launcher lenovo made, not only it looks iOS pretentious, it's actually freaking uncomfortable and i knew better when i had my nexus 7 tablet. I'm pretty sure the answers to my wonders somewhere here but i haven't been able to google anything good enough and i figured i would just ask someone experienced. So please bear with me and bother to answer a few questions:

How do i flash stock android without sd card?
Is every phone compatible with every launcher (except for custom apps)?
Where do i get stock android and what software do i need to flash it?
Can i get pc-like tabs in Chrome on mobile?

Thank you in advance!

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