You do not need a lighting kit. You need soft light, a plain surface and a consistent process.
The window setup
Place the product beside a north-facing window with a sheet of white card opposite to bounce light back into the shadows.
Shoot at a consistent height
Prop the phone at the same height for every product so the catalogue looks like one shoot.
Cut out and standardise
Remove the background, apply the same fill and crop, then add a matching drop shadow.
Review as a grid
Look at the finished images side by side, not one at a time. Inconsistencies only show in the grid.
More capture advice in photography tips