Hello i am about to start my adventure with indian cuisine, i am amateur and need some advice from you guys any help i would apprecieate

I have few questions:

1. Is it worth to buy Tikka, Tandori, Masala and other Patak's Paste that are aviable there ?
2. I was thinking about Mustard oil is it safe to use it in the kitchen ? Cause i read that this oil is for external use only ;<
3. Is it optional to use coconut flour instead of coconut block
4. I was broswering through forum and i couldnt find easy/good chicken Tikka Masala Recipe (I will start from something thats easy) would you be so kind to give me any link ?

and there is one guy on youtube i will give you guys link thats making chikken tikka masala takeaway style you think following this recipe will make good masala ?

https://www.youtube.com/watch?v=n1wjyOdNdSw

Thanks for any help