That’s a decent starting set.
VOE is your tank and Luka your healer. Luka you want to replace as soon as possible but healers are tricky. There’s Ayaka at the top and then there’s everyone else way down below her. Refia is better than Luka in my opinion so if you get her keep her. But the gap between Ayaka and Refia is way too large in my opinion. They haven’t done anything to fix this gap either so that can be frustrating for newer players who missed out on the only other 4 star healer who can even compete with Ayaka (Tilith from the Brave Frontier collaboration) and even then Tilith is still, clearly, inferior.
Ace and Aileen will carry you for awhile. Do whatever you can to awaken them and enhancing them. The consensus is that you focus on gearing up a damage dealer one at a time. So focus on getting MAG stuff for Ace and physical stuff for Ailee. Generally the top tier physical characters are better but Ace is a solid unit.
Pirate Jake for you is worth leveling since he can chain decently. You’ll drop him eventually but he can work for you in the meantime. With that said his TMR is amazing. Don’t even think of fusing him. You’ll want both rings at some point.
Speaking of TMRs right now that’s all Ramza is good for. His TMR is great. He will, eventually, be extremely strong when they finally release his enhancements. In Japan his enhancements were meta shifting and extremely overpowered for the time they were released. So in global they are intentionally holding back his enhancements.
Once you get caught up on stuff there will be time to farm TMRs. You don’t want to waste time on TMRs until you have about 100 NRG or more and are caught up on things. Once you start working on TMRs focus on one unit at a time. For example, focus on Ace by grinding only TMRs that benefit him.