Just pre ordered the complete edition as I never played it before or the past games, what are some tips?
Well my first piece of advice is to immediately buy every Gwent card you ever see for sale! Also play Gwent with every person you come across who gives you the option as your first order of business. It's hard to get your head around Gwent at first, but it's a lot of fun and a really nice change of pace in the game when you finally do, and if you neglect it early it can be very difficult to catch up in terms of sourcing cards.
Understand that there's not just a tutorial, there's an entire tutorial region, so just be patient and take your time with the game. Side quests in this game are generally just as good as the main quests, so partake of everything. If one particular approach is starting to bore you, do something else: so if you're bored of exploring, do some quests; if you're bored of quests, do some exploring, etc.
Also, try to complete quests before they turn grey (due to you over-levelling them). A lot of that is inevitable, but try to minimise it as best you can.
The bestiary is your bible, from both a canonical and game mechanics point of view, so always make good use of it and really know who you're fighting at any point.
Finally, try to use all elements of the combat system as much as you can: oils, potions (and decoctions), bombs, signs, rolling and dodging, parrying, counters, etc. There are so many that people tend to forget about or neglect a lot of them, but you'll have a lot more fun (and be a lot more effective) if you make good use of all of the tools available to you.