Hey People. Mittins here

Thought I would sign up because I've gotten back into W40k again and I thought this might be an awesome place to see how to model/paint a bit better/Learn to Play and have an awesome place to hang out

My warhammer history hasn't been great so, I've been in and out of it quite a few times (I believe this is the third time I've done it now). First time I was too young to really earn the money needed to get my army together beyond a troop selection and the second time the mate I was going to start playing this with kinda bailed so I gave it up then
So yeah, I'm going to make a proper effort to get back into it this time, Just starting to learn the 5th edition rules because the little rules I knew were 4th edition. Like Rapid fire being able to shoot twice within 12" regardless whether they moved or not was one of the biggest "Woah nelly" moments for me ^^ (although finding out theirs a 6th edition scares me a little and makes me :s about learning 5th ed!)
Starting a new army as well to go on top. I was going to try and carry on my tau army, but their unit choices just annoyed me (It was too restricted in what you could take. My army list was going to be about 6 different units, 3 being variations of a single model.
HQ crisis Suit, Crisis Suits, Broadside Crisis suits, Firewarriors, Sniper drones and Kroot...) so I had a look at what army would give me a load of toys to play with.
Went with Chaos since I liked their idea of having loads of different kinds of units and the whole mark of gods things also allows more customization, Although I can see myself going mainly Nurgle because the god fascinates me for some reason although I'm not going to neglect the other gods (want some Noise marines, Thousand Sons and Khorne Berzerkers)
So yeah, Hello people, I hope I won't annoy people with my nack of knowledge for the game and my endless questions, starting with my chaos lord that I've picked up.
Does giving him a Daemon weapon remove his standard 3 attacks? (like, Is it just 1D6? or 3+1D6?) and, Is it better to go with Twinlink Bolter or Combi Flamer? I'm thinking about swapping his Twinlink for a combi Flamer so I can pick up a few model hits before I send him into the fray (which I'm shouldn't last too long with him having charge + Mark Of Khrone + Khrone Daemon weapon (meaning I roll 2
D6's instead of 1 for my attacks *drools* and maybe the standard 3 attacks :S?)