Personally, I use a few different versions (KJV, NKJV, ASV NASB, ESV and so on). I don't care for the NIV as much as the others, but it can be helpful at times also, and I don't think there is a wrong version to use....even if it isn't exactly perfect, I believe God is big enough to use anything to achieve His purpose.
I was taught to read by the KJV, so it comes easy to me to read it now, but I understand that isn't the case for everyone. Like others have suggested, I use Biblehub.com or biblegateway.com if I come across a passage I just can't grasp, so I can easily read it in other versions until it makes me say, "so that's what it means" or something similar. Keep at it, study don't just read, and always pray before reading, for God to lead you to what He wants you to learn or see within the words, and you will get it. Like I said I learned to read by the Bible, so I have read it many times, and I still learn new things when I study it now. Trust me, you will learn something new every time you read it too. The best advice I can give anyone, when they are wanting to study the Bible is to let God lead you and to Go into it prayerfully and with love for the Lord, so it will be enjoyable to learn more about His nature and will.
If you ever have questions, feel free to ask someone too. Pastors, leaders and other Believers can give you their understanding of things to help you gain the full meaning of things too. I might not ask in an open forum, because everyone has their own understandings often (it might turn into a debate among the ones wanting to help you, and that can get confusing). But asking someone you trust to help you understand is a great way to form closer friendships and to gain a better understanding of things.
Peace!