I'm bumping/hijacking this thread (sorry!)

I want to eat vegetarian. I don't enjoy meat, and I just feel horrible thinking that I eat helpless animals when there is perfectly good veggies etc to eat instead. I have been thinking about it for about 3 years now, and it just feels like something I have to do, and I feel like now is the right time.

So... Where do I start? At the moment I am living with my grandparents, and Nan does pretty much all of the cooking. I'm hoping I can find recipes I can cook on the weekend and freeze, so Nan doesn't have to cook anything separate for me during the week. (hah I sound like a spoilt brat.... I work full time and Nan loves cooking, she won't let me help her cook during the week lol but I do help on the weekends!). I'm thinking something like spag bol but with lentils instead of mince, but I'm a bit stuck as to how to prep the lentils? And maybe some veggie curries for myself (my grandparents probably won't eat curry unless it's super mild)... So yeah. I just don't know where to start really... I don't want to be an inconvenience to my grandparents kwim?

Also should I be taking supplements or something?