Billy Kelly said
Welcome. Ask about a charger you'll get 20 different opinions. Most work. Some are faster and have more features. But not always needed. I used an simple basic used charger for 4 years without issue. Other then bit slow.
I will always suggest running stock first to get feel for it. Yes tires make big difference. But unless you can compare to something, how can you know. And you'll get 50 different suggestions.
100% agree. Run it stock for awhile and you'll be surprised at what it's capable of. Especially if it's your first RC. There really is no "best" when it comes to most of this stuff. Like Billy said, you'll get a million different answers from a million different people. I've had good luck with SMC, Zippy, and Turnigy batteries. For chargers, Hitec and the Thunder AC680 have both been good so far. There are tons of great battery and charger brands out there. Don't worry too much about upgrades right away. Once you start, its hard to stop. Before you know it you'll have more $ in upgrades than what you paid for the whole RTR truck!!! Welcome to the hobby George!