Any advice for a newbie??

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Hi im new to all this. Iv never struggled with my weight or had to watch what i eat or live in the gym! Iv had 3 babies and been lucky enough to just ping right back. Around 2 years ago i had ONE Depo Provera shot and piled on a ful stone in 4 weeks and since then no matter what i do it jut wont shift. Iv never been body concious but since then its really affecting me and probably those around me with the way iv become. Iv tried everything and just nothing is happening! Any tips/advice or new friends would be much appreciated! Thanks guys xx