Lipo's just a battery, there is a BRCA approved list, need to obey a few lipo rules and you will have no problems, and you can manage on one battery each & the same charger, so Lipo with any motor/esc. (if the lipo's drop below approx 6.3volts or something its not good for them & may not recharge, most modern esc's have a cut off to stop this)
Brushless motor must have a brushless esc, can come as a combo and is almost fit & forget (and no more expensive than brushed combo, cheaper in the long run). I don't know what the slowest brushless is, with a half good transmitter you should be able to turn down the end point to limit speed.
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