there isn’t really any guides in the Forum, just advice of what to do. but everyone has there own way of doing things, so there isn’t really one way to get started. some players have experience in other games similar to DQ and just start playing. some don’t. some play and learn as they go along, and others read the Codex all the way through first, then check out what is on the DQ Forum, and then they start playing. then there is the group of players who focus on PVP and others who focus on PVE, and those who do both.
as far as a guide, take a look in the Codex > Legendex. there is a list of Legend items for each class. this might suck, but you get to learn what there is to look forward to when you get loot from monsters. there is a Chest/Head combo that has Adventurer Set that has Experience Boost and Fortune affix. all classes have this combo. there are a few more Set combinations that have a focus on Farming with Fortune Skill affix, Luck and Gold Find, and some also have Item Drop affix bonus. these will help you get a head start on your farming for whichever class you are using.
take a look in the Codex > Dictionary. it is a little out of date, but most of the information is still good. affix, map affix, monster affix will help you in the early game, and Crystals can help when you get enough to start personalizing your items. Set affix is a good thing to learn, and take a look at Natures. all beginning items have Haste Nature, which gives a small boost to your Attack Speed, I think +15% total. items you pick up will have random Natures, so knowing which boosts you have can help. later you will find Crystals that you can use to put Natures you want/need on the items.
Edit:
do a search using either Noobs or Beginners. I just did and realized there is a lot of other players who asked the same question as you did, and there are a lot of answers that might help.