I usually compare a razors aggressiveness to my Gillette Adjustables. As far as a beginners choice of razors, The Erwin Jagger DE89/MuhleR89 (same head) Merkur 38 or 34c rated between a 4-5 on adjustment for a Gillette Slim, FB or BB. These razors are not only good beginners razors but are for many a go to razor. Another line of razors are the Parkers, the 91r and the 98R 99R (more aggressive) are 2 more to research. Then their are the Above The Tie razors, these cost about $185 but are made in USA are stainless steel and a choice of heads and handles.
When ordering you razor I would also order a sample pack of blades. the right blade for the razor of your choice is important.