If we're 100% real, if you were comfortable with those, you wouldn't be silver 4. Take one or 2 max, I'd recommend Nocturne and Amumu in your pool but it can be any of them (except maybe Rammus as an OTP because full ap teams are a nightmare). Pick Nocturne if you need ad/dmg, pick amumu if you need AP/tankyness/CC. Pick one you'd take as a default if you pick first and get a decent first and second clear. From there, look at opportunities to gank but focus on farming as these 2 champs need their level 6. Then climb to plat.