Aha, I found something for you. I can't find your exact post in this thread, but I know it was you who said it. I had mentioned the Old Testament, and you said it was useless, and if it wasn't to show you where...(words to that effect at least.)
I found it. Now I know that you are big on the NT, and adhere to Christ, and the teachings in the NT, so we're starting on a good foundation here.
Why should you read the OT?
The answer is given in 1 Corinthians.
1 Corinthians 10:
10 Moreover, brethren, I would not that ye should be ignorant, how that all our fathers were under the cloud, and all passed through the sea;
2 And were all baptized unto Moses in the cloud and in the sea;
3 And did all eat the same spiritual meat;
4 And did all drink the same spiritual drink: for they drank of that spiritual Rock that followed them: and that Rock was Christ.
5 But with many of them God was not well pleased: for they were overthrown in the wilderness.
6 Now these things were our examples, to the intent we should not lust after evil things, as they also lusted.
7 Neither be ye idolaters, as were some of them; as it is written, The people sat down to eat and drink, and rose up to play.
8 Neither let us commit fornication, as some of them committed, and fell in one day three and twenty thousand.
9 Neither let us tempt Christ, as some of them also tempted, and were destroyed of serpents.
10 Neither murmur ye, as some of them also murmured, and were destroyed of the destroyer.
11 Now all these things happened unto them for examples: and they are written for our admonition, upon whom the ends of the world are come.../
So everything that happened to them in the OT happened for a reason. Not only was God dealijg with them, but He dealt with them in such a way, as to give us in the last days an example of what and why and so forth. So the OT is very much worth studying. This is why they say the OT is full of types and shadows of things to come.
It is not two books, Brother. It is one book, complete. The NT may be somewhat mis-named. For it is not a "new" covenant (as in brand new) but a modified covenant. An addendum to the original covenant. Just like in modern contracts.
There you have it Brother.
Glad I could help.