This is exactly what I did for my bespoke/mtm wardrobe.
The first thing I did was buy 7 pairs of pants. Charcoal, black (just joking manton!), mid-grey, chocolate brown, tan, white linen, navy nailhead, light grey.
The first sportsjackets I purchased were all plain and essentially various shades of blue.
The way to vary things is with shirt and tie. By going with plains for your first sportsjackets, you avoid people recognizing the same jacket over and over again. The jacket and pants are just a frame if you will.
When selecting fabrics, I always make sure that I have at least two matching pairs of trousers/shirts for each sportsjacket so that I don't have to repeat the same outfit every week. Of course, for some jackets just about all of my shirts match. Either way, I can now go weeks without the same combination.
It definitely makes sense to have a plan, otherwise you'll always be in a situation where you have clean clothes but nothing to wear.