Welcome,
;As others have stated, it all depends on what your goal will be. if you just want low power, shoot in the basement, or 10-20 yards plinking at paper, cans, spinners, a Co2 can be a lot of fun. I just picked up the Diana Chaser pistol/rifle combo and having a blast with it in my basement range (30 ft). But power wise wouldn't want to shoot at anything for a clean kill. If you are looking cheap a Daisy 880 multipump with cheap 4x scope can be a decent alternative just a little above the CO2 for power, but light weight, easy to shoot, Might be good for chipmunk, sparrows, starlings out to 15 yards or so.
If pesting is going to be your plan at further distances either a good springer, or PCP is a better choice, and you can also use them for fun plinking. The Benjamin Marauder is a great choice in my Opinion for a good starter PCP. When you go into the PCP world, air supply is your biggest drawback. Pumping a marauder isn't too bad, but if you are going to do a lot of plinking or shooting, pumping gets old really fast. Before long you will be wanting to get your own compressor, and of course a spare tank for refilling at the range or when you are away from the compressor.
Then you will probably get hooked on the accuracy pursuit and want something better. Beware.
Overall though to answer your last question, Yes, a Benjamin Marauder is a good choice for entry level PCP.
Enjoy the sport, and be safe, and have a lot of fun.