Normally don't engage in these threads anymore, but I have a mini crush on the OP so...
Oops. That makes me a creeper, according the the RJ definition. Well, I guess I'll own my creeper.
Back to the question...
First, go to the RJ home page, below the "Latest Forum Topics" section, and pick "chest" from the "Choose a muscle group to view exercises:" pull down. You'll get 39 matches. Pick 10 you like, and throw them into your workout.
As for the "middle" or "inside" focus, that's a common ask, and there's no real answer cause the pec is one big muscle with multiple attachment points around the sternum: an upper, a mid, and a lower. The muscle is also layered, in that there is a deeper (or "inner") layer, which is often misinterpreted as meaning the part closest to the sternum, rather than a slab that lays closest to your rib cage, and an outer, which is closer to the skin.
You can't really exercise the "inner" chest as you define it in your post, as that part is just a collection point for a bunch of fibers that stretch all the way up to the shoulder attachment.
The only way to get "inner" development (as you define it -- i.e. near the sternum) is just to make your pectorals bigger in general. This will push them out away from your rib cage and in the process, make the "crack" between them above your sternum more pronounced, and voila, you can say you have "inner pec" development. But the actual shape and how they attach is something you were born with and you can't change that.
I'd perhaps organize your chest work based on the attachment points, making sure you hit the three groups of fibers: upper, mid, and lower. You can Google any anatomy chart to see pictures of the attachment points.
When I do chest, I make sure to include an "upper" a "mid" and a "lower" movement. To further mix it up (and mixing things up is pretty much the only important thing in designing workouts), I slice it two additional ways: push movements vs fly movements, and then by equipment type (barbells, dumbbells, cables, and all the different types of machines for chest, of which there are a dizzying array, cause we gay boys love working chest).
So I walk in on chest day and spin the wheel and decide first: dumbells? cables? machines? which machines? or some combo. (Usually that decision is heavily influenced by who's currently using what, as some guys love to tie up stuff for 45 minutes as if it were their own personal gym). Then I decide which one of those will be a push and which a fly (some combos don't make sense), and then I make sure I hit the upper, mid, and lower with something before I finish.
Whew. This is another reason why I don't get into these threads anymore. I don't believe simple answers are of much help to anyone, so I kinda word vomit.
But hey, the OP is hot, so... yeah.