if you are getting a different size, then you will have to get 5, otherwise , 4 should do fine
stock size is 165/65 R13. I suggest you stick to 13". 14" will cause reduction in pickup, and make the steering heavier. the benefit will be better stability at higher speeds and bad road handling.
Unless you have already had problems with rim bends, you can go ahead and switch to tubeless - it is the better tyre - truth is , MRF makes better tubed tyres than tubeless, maybe thats why the guy said so. There are other manufacturers who make better tubeless tyres, why not try them
you can try 165/65, 175/65 or 185/60, in the order of reducing comfort and FE, and increasing grip.
Michelin XM1 is a premium tyre. Apollo Acelere are a good VFM tubeless tyre , and cheaper than the michelin, and almost as good.
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