From what you said, you should be able to use some simple software, but you are not creative. I recommend you to go to Shangyuan in Wuhu Pedestrian Street, where graphic design is very popular. You can go and have a look. It seems that what you should learn is to do this job, so you must learn it well and thoroughly. Shangyuan can take classes in cycles. It's on the sixth floor of Santai International Building on the pedestrian street. Shangyuan education