I’d say perhaps get the Solarforce Z2 if you will only buy one, its good value for money.
Alkalines will work but eventually you will want to use eneloops.
The best 2 places for you to get eneloops would probable be:
Have a read there
Or
Dont buy eneloope “lite”, also I belive those Fujitsu AA battereis there are relabeled eneloops and are good value.
For now I would buy just 1 and play with it til you get to know how it works and how long it runs and how bright it is etc, then you can make a decision later if you want something that runs longer or is brighter and you can use the first one as a reference.
Generally stay away from most lights,chargers and batteries with “fire” in the name, there is a few exceptions but just to be safe for now.
If you need a charger let me know and I’ll have a look around at one going for a good price.
Most people here are pretty helpful and if you need help understanding anything just ask and someone will try to help you.