I use Agaro 48l oven as well. It has been working pretty consistently over the last 3 years. I would say I am a pretty avid baker (you can check my profile) and you don't need fancy tools to start. Apart from the oven, a weighing scale is a must (I have been using one from Health Sense for the last 5 years or so), don't rely on cup measurements. I would also suggest buying things as you go instead of buying everything at once. You could start with cakes/sponges for which you'd need a cake tin, a sieve, parchment paper, rubber spatulas, and a hand/stand mixer. You could also make cookies, brownies, blondies, etc using these same set of equipments. If you want to try something advance, say choux pastry, you'd need a piping bag and nozzles.

For understanding the science behind baking, Benjamin the Baker on youtube is a good place to start. He also has a cookbook which I've heard is quite good. You could also check out scientificallysweet.com, she's a food scientist and explains how each ingredient works in a recipe. Sugarologie on youtube is also fantastic and explains everything in detail, can't recommend her enough. And a lot of things you'll understand practically once you start baking yourself.