Few Issues with Carbon ROM (4.4)

Hi there

i have a few issues with my custom ROM's, it's my first time rooting/using custom ROM's but after alot of screwing around i came to this.

I threw off my Cyanogenmod 11.0 and replaced it with the latest Carbon ROM but i'm having the same issues as i had with CM so i decided to ask them here.
My phone is a galaxy s3 mini GT-I8900 (Belgium, telenet carrier).

Both ROM's did not come with the play store and when i try to install the play store from a apk file i downloaded the application just crashes instantly when i try to boot it, i looked into the depths of the internet for solutions but i have none of the things that could cause it, does anyone have any idea? I do not want the install gapps since that will work (did it on CM) but then all the google crap is on my phone again and i raither keep it clean.

Second, i can't seem to get my 3G to work, on my factory build i had an easy on/off button that did it's job, now i have to go to settings to activate it but even then it will not work, i will get this message that my dataconnection is disconnected because i left my homenetwork while my dataroaming was off, Wtf? 0.o

If anyone can help me with this, i will be eternally gratefull, i raither not go back to android 4.2.1 even though kitkat is causing me headaches --'

Regards