Bandsaw cutting skew - HELP

[garage nut]

It seems my first task is, to get a new blade.

Currently I have a 14T blade, Is this generally the most universal blade to buy?
I will be cutting predominantly Mild Steel with the odd piece of SS or Aluminum.

The roller guides are adjusted properly. When I got the machine the previous owner did not clean them and there was evidence of wood, plastic and steel. I cleaned then and adjusted them to the blade and the whole carrier as per suggestion on You Tube. I still need to replace the rollers behind the blade as they show evidence of where the blade's back is touching them.