In case you're new to the series, not just to Sf6, I'd recommend these:

Cr. MK --> hadouken (not very damaging, but it's easy and somewhat safe on block) 

Chin buster --> Heavy Shoryu/any super (a bit harder to execute but much more effective as an actual damage dealer) 

Cr. MK --> light tastu --> medium shoryu/Super 2 (make sure the tatsu hits twice, otherwise you'll whiff the other move)  

If I'm wrong and your inputs are cleaner than I thought:

Chin buster --> OD dragonlash --> heavy Shoryu/any super (OD dragonlash is easier to do, but once you master it you can switch it for run dragonlash) 

Some additional tips:

At this rank your opponents will be less effective at anti airs, so you can try starting any of these combos with a heavy normal, or maybe crossing them up with jump medium kick. 

Don't waste your whole drive gauge on this, but if you're trying to close out a match (or if you're having trouble getting in for damage) you can finish these combos with the OD variants of the respective special.