Will the 16gb iPhone 6s be enough? Can iCloud

I pre-ordered a 6s plus (16gb) because i finally wanted to upgrade to apple. Then I realized how little 16 gb can be.
With ios 9 there's supposed to be "app thinning" but its still a small amount. If i were to pay the monthly $0.99 for 50 gb of storage will i be able to keep photos/videos there and delete them from the phone? (again I've never owned an iPhone so I'm a bit apple ignorant). I don't really have the extra money to go 64 gb(though I'm trying to accumulate the funds…).
Would it be better to stay with the 16 gb with iCloud, assuming it works the way I think it works, or wait and save for the 64 gb?
I'll probably keep the phone for about a year.so 12 months of iCloud = $12
64 gb = $100 more

Iphone 6 is sending texts I never even wrote?

I was texting my boyfriend and all of a sudden he started receiving texts from my number saying "I'm more of a stoner though lol" which i NEVER even wrote. Then, it just kept sending that over and over again and starting duplicating other texts to him as well.
Is anyone else dealing with similar issues?

Should I just take it to the apple store or my phone provider?

Can I retrieve data off a dead iPhone?

I was gonna get a new phone, but i dropped my old iPhone in a pool. It doesn't work anymore and i was wondering if there was anyway i can retrieve pictures or more importantly contacts from a dead iPhone.

P.S. How much do you think i can sell my iPhone 5s off ebay if it doesn't work

How to get rid of other storage on my iPhone without restoring it?

I just got a brand new phone, and in the store, I restored the new phone from backup from my old phone. All my stuff transferred, including 5 GB of "other" storage. I've researched how to get rid of it, and the only answer seems to be restoring it from backup; however, I did that when I got my new phone, but the other is still there. Is there any other way to get rid of it?