hello and thanks in advance for advice

i am in cambodia on a retirement visa and plan to retire to Thailand when my visa expires here in September. i have 3 large pieces of luggage and several small pieces too. extra luggage has been an issue at airports in the past so i am thinking of hiring two different private cars to go to pattaya from phnom penh. i have never entered Thailand except by plane, but i did leave pattaya by bus after flying in , last november, because i wanted to know how feasible bus travel is. i don’t really want to travel by bus if possible.

is there an airline that is best for carrying extra luggage?

does entering Thailand by bus instead of plane impact my chances of getting in and then getting a long term or retirement visa?

Hi :) When I apply for a tourist visa in Penang, do I need to show an entry flight ticket to Thailand or can I take a bus/ferry to Thailand?

Also, do I need to show a 3-month bank statement of how much?

(I'm Romanian if that helps in any way)