Dandd 5Th Edition Group New To 5E What Should We Know

My long-time D&D group is switching over from Pathfinder to 5th edition for our new campaign starting next week. We tend to play these campaigns for quite a long while (1-2 years), so I want to get things right as far as designing my character and making sure the group is diverse enough to cover the needed adventuring roles. There will be 6 PCs.

What advice can more experienced players give as we figure out what characters to play in our first game?

Are there any good printed character sheets out there yet? I searched through Reddit and didn't find much beyond this one, which is good enough but I expected to find a lot more. What do you use for a character sheet?

How important is it to have a character in the group who can cast healing magic? Is a Ranger good enough at covering that role or will we need more healing? I am worried about the ramifications of no more "magic item shops" and so being unable to buy wands of CLW to cover a party that has a lack of healing spells like you could in 3.X edition.

Can a Warlock cover the arcane caster role of a group, or is his spell/day too limited for that? How important is it to even have an arcane caster?

Any other advice/tips for someone coming from Pathfinder to 5E?

Reference: witch-selena.blogspot.com