Yes, just tell the park you are 30 amp. You can also tell them you are a new RVer and ask for assistance with your hookup. Most places will be willing to give you a hand. Also your new neighbor will offer help if you ask.
Your Rig is set up for 30 amp,so just plug into the 30 amp socket. The plugs are different so you can easily spot the correct socket. Always flip off the shore power circuit breaker before plugging in...shock protection. Then flip the breaker back on. It is not a bad idea to pick up a household type plug adapter (20amp), you can put it between the 30amp plug and a standard household socket. Nice to have when visiting friends if you want to tap into the garage or backyard power. With the lower amps you will have to restrict your power usage...no a/c, no microwave, but you can use lights and coffee pot and stuff.
Don't feel shy about asking fellow campers for assistance. For the most part we are a friendly bunch.
Happy Trails.