I would suggest you to do a circuit training with barbell that consists mainly of compound movements, such as:
Deadlift
Overhead Press
Bench Press
Squats
Do as many repetitions as you can in 30 seconds, followed by a 15–20 seconds break interval and proceed on to the next exercise. Your weight load should be approximately 45–60% of your maximum weight. If you need to buy good burbell, here you can check top pick -
best olympic barbell.