Logo basic edit, transparent background and basic design

Description

Have a basic logo lettering which is black on white and white on black. Want that logo to be updated so background is transparent and actual logo letters can be coloured with any colour of choice with a simple MS paint fill.
Also want the same logo but with some minor changes which i can describe in more detail.
Finally for those of you who are creative any ideas for a simple branding emblem are welcome
All must be provided in ultra high definition images.
This should be a very quick job for anyone with photoshop experience