How to transfer bitcoins from old wallet to new wallet? Have no wallet.dat info I've been researching and trying different things for few weeks now and I hope that you guys will be able to help me out.

I'm attempting to recover my bitcoins from years ago.. but I have no wallet.dat on my backup and was wondering what's the best way to transfer them to a new wallet I've created? 

Blockchain does show that I do have some BTC but I have no idea how to get it showing on the Bitcoin Core.

Thanks in advance
If you were using the Bitcoin QT (aka Bitcoin Core) client, then the private keys you need are in the wallet.dat file.

If you can't get that file, and you don't have any other record of the private keys, I'm sorry to say your funds are lost.

If you had used the Electrum wallet instead, you could recover your keys using the 12 word "seed", if you had that.

There were other wallets in use too; if you think you used something else as a wallet, let us know.