You can't start a new character in Epic.  What you can do is start the one that's done Ragnarok in Epic since that character has unlocked that difficulty.

Difficulties are not globally unlocked; each character has to unlock it for themselves.

What do you mean your husband bought the expansions on GOG?  Are you saying you're trying to play the GOG expansions with the Steam base game?  Because that isn't possible - or shouldn't be.

Welcome to the forum.    Yeah, there don't seem to be many people playing it on mobiles, though I think there are a few people on the official TQ Discord who do.  https://discord.gg/RX8KakD

Funny you should go in that direction because I recently started a bow Elementalist (Storm/Earth) just to see how it might play.  Not very far along yet, only L22 and reached Memphis but it's been fun so far.  To be honest strength shouldn't really be a problem because you should get plenty of int from both Nature/Earth and dex as well.  So going 1:1 str:dex should give you enough of both to equip bows since they don't need a lot of strength.  Dex may be more problematic so keep an eye on it and maybe switch to 1:2 str:dex if needed.  Nature doesn't rely on int for it's skills so only Earth and Storm that do. 

There are a couple of hybrid build ideas which Irma2 did many years ago which could work well for you since you only have the base game on mobile.  An elemental Sage and an Avenger

Sage:
Elemental bow Sage - http://www.titancalc.com/TitanCalc.asp?mastery=Sage&master1=7&master2=8&sa=21&m1=32-0-0-6-1-12-6-0-8-0-1-8-12-0-1-10-1-0-6-12-6-0-0&m2=32-0-10-6-0-8-8-0-12-0-0-0-6-12-0-0-1-1-0-8-0-0-0
I feel that I can afford to drop Find Cover to just one point, as Squall takes care of most ranged enemies. Marksmanship is also reduced to accommodate the elemental skills.

Avenger:
Bow Avenger - http://www.titancalc.com/TitanCalc.asp?mastery=Avenger&master1=7&master2=1&sa=21&m1=32-0-0-6-1-12-6-0-8-0-1-8-12-0-8-10-1-0-6-12-6-0-0&m2=32-12-0-8-1-0-0-1-16-0-1-8-0-0-1-1-0-0-1-8-12-0-0

He made quite a lot of different build ideas and you can find them here

https://titanquestfans.net/index.php?topic=679.0

Just released.

https://titanquestgame.com/atlantis-out-now-on-consoles/

Not that I can recall.  Shen-Nong's Dark Medicine relic can reduce all resistances though and there are probably some items that might too.

Welcome to the forum.   

Yes, it seems to be a problem for people using the disc version of TQAE.  The devs are aware of it and are working on a fix for it. 

Hunting can be played either way.  Many people focus on the spear side giving that priority over the bow user side of things.  For me Hunting is always bow first so while I may carry a spear as a second weapon I usually don't bother to put any points into spear skills.  You can probably do both; it's just a question of what other skills you don't use instead from Hunting and whatever other mastery you pair it with. 

Now available on PS4 and Xbox too.

https://twitter.com/THQNordic/status/1242451251129921536

Just by learning or reading guides.  Defense's Battle Awareness for example is usually only taken with one point because you really want to max out it's synergies Focus and Iron Will.