If you're unsure about what sort of playstyle to go for in Mass Effect: Andromeda, you might want to check out the latest preview video. It briefly goes over all of the weapon types, some of their potential upgrades and utility options, as well as some of the powers you'll be able to pair them up with.
You'll find the video right below, and don't worry about any spoilers as there is absolutely zero story of any sort. Anyway, here's the video:
If you're looking to even further expand your knowledge about Mass Effect: Andromeda's combat, you'll find the first gameplay preview video over here. It showcases some of the basic combat mechanics, skills and their effects on the battlefield, and all of the above mentioned weapons in action. And if you would like to delve even further you can find the second preview video right here. This one is mostly centered around squad based tactics, gameplay and weapon variety, and devastating skill combinations. Enjoy!