Welcome aboard Bassboy, hang onto the sides and enjoy the ride. This is the most friendly board there is. Questions will be answered by knowledgeable members, and your learning curb will be shortened.
As far as your equipment goes, if you are comfortable with each rod and reel, and they are not in need of repairs, stay with what you have. Buy new only as you need to replace or add to your arsenal, but buy the best you can afford, (hurt once and have enjoy for a long time)
I would replace the line you currently have with fresh line. Your spinning reels should have 6-8# test mono or braid. (braid tends to be expensive, but will ast quite a while) Don't have to get caught up in all the new lines on the market. Quality mono, will work just as well.
Dyneema and Spectra are the same chemical product. In Europe they call it Dyneema, here in North America it is called Spectra. Brand names are subjective, braided lines will be peform the same.
If you choose to use a braided line on your bait cast reels, you do require a backing, remove half of the line on the reel, us a blood knot connect the braid to the mono and spool tightly. I would suggest a minimum of 65# test braid. (You don't want to see an expensive lure flying off into the yonder, if you birdsnest, from experience using 50# braid, a profession overrun, the line snapped and my expensive bucktail was last seen sailing into the yonder)
I would also suggest using a fluoro-carbon leader. You buy a spool of Seagur Fluoro-carbon about 40# test, a few ball bearing swivels and snaps, and you can make your own. (fluoro is relatively invisible under water, so the diameter will not spook fish.)
When launching by yourself, I have learned that an extra long rope tied to the bow eye, the conveniently placed inside the passenger door, works well. You can easliy back the trailer into the water far enough to float the boat, then exit said vehicle,grab the line out of the passenger door, and walk towards the dock and the boat. Secure boat to said dock, and park vehicle. The difficult task (when alone) is loading the boat back on the trailer after a day of fishing
Enjoy your new toys, and make fishing what YOU want it to be.
John
Remember, prep the boat away from the actual launch.