If your baby can stand, you remove the PU part because they'll settle more quickly in their bed. If DS stands up, gently lay him back down (one hand behind the knees, the other behind his head). Tell him in a soothing voice that it's ok, he's just going to sleep. You can also, calmly and quietly, recognized his feelings ei. "I know you're feeling frustrated/tired right now, that's ok. You'll feel better with some sleep". Keep at this, even when he's only able to sit up because he's so pooped. Eventually he will just stay down and nod off. The important thing is that he knows you're there to support him. You may need to stay until he's completely asleep the first few days/nights but over a few days you'll be able to slowly fade that out, moving further from the crib.
With the night wakings, I would recommend you not feed him at all when he wakes because this becomes a prop. If he's in the habit of always being fed when he wakes, this will likely be a difficult one to break but worth it for both his and your sleep. You'll need to PU/PD for this as well (minus the PU, as above ^^)Make sure he's getting enough food and milk during the day; 3 meals, maybe a healthy snack or two and 15-20oz of homogenized milk or breast milk. If you're hitting all these and he still wants to be fed when he wakes, it's definitely becoming a habit.
Let me know if you have more questions and keep me posted how it's going!