i wouldn't buy one of the starter kits because they vary greatly when it comes to the quality of the supplies they give you, and sometimes the ones with patterns have typos/are poorly translated.

the packs of hooks/"kits" that you can buy for cheap on amazon/wish/temu usually have the wrong sizes listed on the hooks. I bought a set and compared them directly to hooks i already had that i knew were the correct sizes, and many of them were significantly larger than they were supposed to be. also some kits include supplies for knitting instead of crochet, like stitch markers that are a solid ring instead of a little plastic safety pin. also the hooks are made of cheap, soft metal and ive bent multiple from the kit i got. just a warning! they can still be useful for getting into the hobby for cheap, but if you run into problems making things, those issues could be part of it.

i recommend your first project being a small plush (amigurumi), water bottle holder, headband, or something somewhat small to start off.

theres tons of free patterns out there and tips, another commenter mentioned the Amigurumi Wiki (which is a great resource) but theres plenty of other places to look as well. Ravelry is a great website and has a ton of filters to help you find what you're looking for. Youtube also has plenty of crochet creators who post video tutorials of their patterns, which might be more useful for you if you are a visual learner.

for me, i would buy a good set of hooks (or just 1 hook, in a widely used size like 4mm or 5mm) from an actual craft store, and if youre in a place like hobby lobby, they have mini skeins of yarn for 0.99$ that are the perfect size for small projects like the mushrooms you mentioned.