Normally, my base is anywhere I can dump all of my loot ^^; It's often not until much later that I decide how I want my base to look aesthetically. For example: upon entering a new world, I decide what kind of atmosphere I'd like to spend the most time in like badlands, desert, savanna, taiga, or, my favorite, mushroom fields (because I genuinely suck at fighting off mobs). Once I'm in the biome, I throw a chest down, dump all my valuables in it, set my bed next to it, build some walls around it, and that's it. Base.