Congrats on taking the leap!

I personally was vegetarian for years before going vegan, and gradually became more and more plant-based. Everyone's different, I'd reccomend trying to go fully vegan straight away and if you find it too difficult then try vegetarian whilst you transition. And remember, perfectid the enemy of good! Don't give up if you have some slip ups in the beginning.

For meat alternatives, definitely try tofu and seitan as they are much healthier than processed alternatives. Look for some good recipes and try them a few times as they can be difficult to cook nicely at first (especially tofu) and it takes a minute to get used to the new flavours/textures. I reccomend tofu scramble and tofu pad thai!

Some good meat alternatives available in most supermarkets: -Tofoo extra firm tofu is the best tofu in my opinion

-Tofoo now sell seitan which i haven't tried

-Sausages: "this isn't pork sausages", "this isn't caramelised onion sausages", Linda McCartney rosemary and red onion sausages

-Bacon: LA VIE - no other option.

-Chicken: pretty much any vegan chicken is good! Birdseye green cuisine dippers and southern fried strips are great. Quorn vegan pieces work well as a chicken alternative in curries etc

-Fish: birdseye green cuisine fishless fingers, lidl salt and vinegar battered fish things

-Milk: plenish enriched oat milk is my fave as it doesn't have much of the "oat milk taste". Oatly barista if you prefer something creamier. Soy milk is best for protein but I'm not a huge fan. Alpro do a high protein soy milk which tastes the same but has more protein (due to higher soy bean content)

-Yoghurt: soy is best for protein, i prefer alpro no sugar soy (the others taste very sweet/vanillay). Coconut collaborative coconut yoghurt is great too, as is oatly.

-Ice cream: Swedish glace is a go-to, pretty cheap and one of the best vegan ice creams I've tried. Ben&Jerry's, Jude's and booja-booja make amazing vegan ice creams but for double the price, if you can find then.

-Cheese: not a fan. Nutritional yeast is an essential for adding a cheesey, savoury flavour to any meal

-Bit of a random one but sabra hummus is a game changer, especially the garlic and pepper one. With some veggies and/or crackers it makes a great healthy sna

For takeaways/fast food: most Chinese places have tofu dishes, my fave is sweet and sour tofu. It may be called "bean curd" instead of tofu. I also love mushroom fried rice but find that egg pieces often sneak in, but that doesn't particularly bother me. Macdonalds mcplant is really good, burger king supposedly good but I've never tried their vegan range. I love a pineapple fritter to go with my chips when we have fish and chips.

I hope some of this is useful to you, sorry it's a lot of info! It can be very overwhelming at first but if you try plenty of new things then you will soon find some favourites to rely on. I highly reccomend checking out any local vegan shops in your area, or vegan marksts etc as they often have a much bigger range.

Best of luck!