Congrats on your new-to-you Sunseeker. For a newbie, I'd suggest 2 things that really helped us:
1) Checklists, so you don't forget something. Your checklists will grow over time with more experience.
2) Spend lots of time on this forum learning things you had no idea about regarding RVing. There is a ton of great tips here, from black tank maintenance to cooking.
EDIT: One more thing I found really helpful was YouTube videos by RVGeeks
, Love Your RV
Camping at a park near home the first couple of trips is a great idea. It will help you sort out what you can't live without and what you can do without. Booking a full hookup site a couple of times will allow you to take your time when dumping the tanks and you can ask your neighbors for advice. You can even fill the fresh water tank there to make sure the water pump works properly before you try camping without a water connection.
2011 Rockwood Signature Ultra Lite 8293SS, 12K Equal-i-zer
2016 Ford F-250 XLT SuperCrew, 6.2L, 4x4, 6'9" bed, 3.73
2010 Rockwood Roo 23SS (2012 - 2014)
2009 Ford F-150 XLT SuperCrew, 5.4L, 4x4, 5'6" bed (2012 - 2016)