Please don't do controlled crying, your Lo is way too small. When I was in your position I thought 'sod it' and tried the 'Contented Baby Book' by Gina Ford. It absolutely saved my sanity. My LO responded really well to the routine and has slept beautifuly ever since. Her weaning and older baby advice has also been spot on and my little boy is so happy and content it is wonderful.
Whatever you do just know that at the moment your little one is very small and cries for either food or sleep or if unwell so you must not cry down. I would say even going forward, if your baby cries at night and you find you can settle quickly with a feed then just do that and don't torture yourself or baby with crying down or water. The best thing you can do is teach your baby to go quickly back to sleep and that night times are quiet non attentin time (which means try to avoid eye contact or talking and keep lghts dim). If you are consitant your baby will learn quicker when sleep time and awake time is.
Keep us updated and all the best.
Becs x x x