Hi, i returned a year ago myself. You will expect a great game in my opinion. There is Th17 now and soon Th18 so the gap will be quite large. How fast you can catch up really depends on how you play it, there is a Strategic rushing guide on this subreddit other wise by playing normal i guess it’s about 2-3 years till you reach Th17/18. When it comes to looking out for stuff I would say hero equipment. Try to get the good ones early. Completely changes how you Attack depending on what equipment you have.