Really trying to like this game but so far no luck. Ive beaten FO3 but Im just haveing problems with NV. Any general tips? Also, I know theres normal, hallow point, and armor pericing. How do I switch ammo types?

Hit 2 on default controls for PC. Based on the weapon wheel, it should be up on the D-pad for console.

On the PC, you can switch ammo types while playing by pressing the "2" button when your gun is out. This will cycle through the various ammo types for that gun. I don't know what button you have to press on consoles, but the tutorial will tell you.

Alternatively, you can do it from the pipboy, and in particular, the ammo menu.

Basically, for un or lightly armored (<8 DT) targets, you want hollow point ammo. For higher armored targets, you want AP. There's a few more specialized ammo types out there, some of them pretty cool (.50 incendiary? Hell yes, it kills people and sets them on fire at once!), but standard/hollow point/AP is the main thing you need to keep in mind.

Energy weapons, as far as I'm aware, have bulk, overcharge, and maximum charge. Bulk is substandard crap, but you can buy lots of it from ammo boxes. Overcharge does more damage but degrades the gun's condition faster. Max charge is like overcharge, except it gives you even more damage and degrades the gun even faster. The advantage here is that all energy pistols use small energy cells, all rifles use MFCs, and all automatic and/or heavy energy weapons use ECPs.

What other information do you need?