I think that some of the essentials are a spatula, whisk, tongs, kitchen scissors, turner, and a spoon. From there, you begin to see what you might need based on the things you like to make. Kitchen tools are there to make your life easier, so for me I make pasta a lot and a pasta or slotted spoon comes in handy all the time. Once you have the essentials, then you get to add fun ones that you don't absolutely need to have but are just fun. I bake quite a bit, so a cake tester is very useful. Luckily for me, I got a really cute one, but toothpicks are usually something that are on hand and do the job just as well.
One of the newest ones, I have gotten is a lemon and lime juicer. I don't do a ton of juicing, but when I have to it's a pain. Somehow my hand is not as effective and I feel like I am wasting a lot of juice, especially with limes. I have seen the individual colored ones, like orange, yellow, and green for oranges, lemons, and limes, but not one like this. It can be used for lemons and limes. The larger bottom section holds the lemons and the middle section is for limes. All you do is put the half of whatever you are juicing in the appropriate section and squeeze. I think that it will be much better than me squeezing them by hand.
I know that you are probably thinking that this is a pretty expensive toolbox, but it doesn't have to be. I am not a seasoned chef, so I am okay with not having professional grade tools, which can be very pricey. The higher end kitchen stores, like Willams Sonoma and Sur La Table, have these tools, but are more expensive. I have found that Marshalls has a lot of these for about half the price and they have well known brands like KitchenAid. I hope that you have a better idea of how to put together your own kitchen toolbox. Feel free to leave any questions you have. Let me know what your favorite kitchen tool is and if you know of any places to get great deals on tools.