Its my first time too! Take courage knowing I didn't have to buy any diet plan or anything. I got free calorie counter app called FatSecret and I just limited my portions.
I do spend money on a gym pass, but mainly for the pool access. The rest of my exercise is free!!!
But start with small changes, you can try and go for a walk three times this week, cut back on sugary drinks and drink more water, etc. Ease into it