We have not done this for a while so today let's test where you are at with your Bench Press.
It is vital you warm up thoroughly. CFW and some light pressing. I suggest you have a competent spotter with you. If not then try to lift in a power cage with pins set just above chest height. If neither of these are options then perhaps use dumbells-you can drop these away from your body. I stress safety here because every year people are killed at home trying to bench press heavy weights by themselves.
You are going to test your 3 rep max (3RM). Load up the bar with a weight that is below your previous best. Do 3 strict reps. Rest 5 minutes(no less!) and then add weight and repeat. Ultimately you will fail to complete 3 reps-your 3RM will be the last weight you successfully lifted. Add weight in small increments as you go heavier. Use 5kg or 2kg or 1kg plates.
It is important you are strict with you rest periods.
Concentrate on good form and mentally psych yourself up before each attempt. Record your results in your training diary.Feel free to post your results.
Best of luck.