Looking for a step by step breakdown on how to write a proper pseudocode if possible.
and also, are there any words i should avoid when i write it?
for example, i use otherwise instead of else etc.

use all the regular programming terms like if, else, for, while, do, get, set, function, method

here's an example of what pseudocode could look like

int function addNumbers (array numbers){
set total to 0
for each number in numbers
set total to total + number
return total
}

it doesn't matter how you write it, as long as the person you give it to can understand it.