Brave Frontier

Hope it's appropriate for a new like me to post this here
Just started like 2 weeks ago and not sure what my strategy should be for proceeding, since the guides that I can find through Google and Reddit are mostly either "Let's tell you all the basic stuff that was covered in the tutorials" or "We assume you're a 'pro' already so we'll talk meta and use acronyms for everything."
My questions:
1. Should I be spending all my gems on super rare summons whenever there's a rate-up event? Should I be saving them instead?
2. Does the base inventory problem (50 max) ever get fixed with leveling more or do you have to cash in to fix this? My inventory is always full.
3. What I've been doing up until now is trying to save up evolution units and fuse gods for when I actually have units worth using them on. My current options are Lorand (5), Ramna (4), Orwen (4), Reeze (4), Lucina (4), Azael (4), Golem (4). (Seems like the game wants me to do mono-fire or something ) Any of these worth keeping in the long term?

Any other free tips?

BTW, my ID is 0343266919.

[COLOR="#008080"]Hi! I was into the game about a month ago and this might be the best time you started due to the half energy/1.5 xp quests we got recently (and now it's almost over) and all the events going on. ^^

1) What everyone else said. I did 4 summons just now and got someone who was really good (I'll say that later in this post).

2) About 100 should seem alright for a decent inventory space. You shouldnt need a lot of space when you need mid-endgame spheres/items. When finishing dungeons, quests and arena stuff, you get a bunch of gems from them......also the free gem once a day thing for about a week because of the anniversary helps too. To give you an idea, I have 140 space but I usually have duplicates so I'll be left with 1 110- 120 ish

3) I don't know about the others but I use this to figure out who to improve first. Obviously, the recent units aren't there but with the previous post and the batch analysis in reddit, that explains how good they are.

I did 4 summoms. I likey

4* Ramna (G) I just read about her. Feels like Zelban 2.0?
6* Grybe (L) 1st 6* summon!
4* Narza (G) 1st damage mitigation unit!
4* Rowgen (A) 1st Sniper guy! (He'll get along with Dilma and Hogar) xD[/COLOR]