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First, decide what range and target you plan to actually shoot with it. What the bullet is expected to do is more important than what the gun looks like. It's all about delivering enough force at a specific distance to do the intended job.
The trend to intermediate calibers in combat reflects the reality that most soldiers never shot much beyond 500m, and that represents the limit of lethality needed for combat. The recoil of larger guns delivering more power than needed creates less shooting, and less accurate shooting, both of which contribute to more of the other guys soldiers being more effective, and the fight lasting longer. You have to actually pull the trigger and hit someone to take them out of the fight, soldiers have proven over and over they do that better with smaller guns with no recoil much more than big ones.
Accessories are so diverse, not even the Army could pin it down, but still had to meet the needs of it's customer base. Hence, the quad rail fore end, which even the contract supplier KAC has said isn't needed by the average shooter. It's an institutional compromise. If you shoot one gun enough, you'll decide what accessory you need, otherwise publish a CC number for all of us to use for you, and enjoy the vast array off stuff you'll quickly decide serves no purpose.
Scopes go back to - what range, what target? Under 200m, a red dot, over 500m, a 4x12, but we can't suggest anything until it's clearly spelled out.
What makers are best? Goes back to what range, what target? Brand fans will always push their specific one gun experience, but what they offer may be moot if the gun isn't the calber or shoots the range to actually reach out and drop the intended target. It's specifically why there are hundreds of cartridges, and nearly a hundred you could shoot from the AR15.
Until the question is answered, most of what gets posted on the internet is a bit of chest thumping fanboy recommendations about what toys they bought, not seasoned advice to help a new shooter get started.
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