Make sure you do a thorough pre-delivery inspection and note every little thing wrong. Have the dealer show you and operate every system in the RV. Don't drive away without a written list of all the things the dealer will fix (if they say they have to order parts tell them you'll bring it back--never let them hold your RV hostage).
Welcome! Being "new to the RV world" you will likely be overwhelmed on your PDI regarding the operation of all the systems in your RV, so, if possible, you should videotape the PDi so you can refer back to it as things start to sink in as you use the RV.