Is the wallet in raiblocks.net safe? Would be good to have a checksum.
Anyway, I downloaded it, but it says I am disconnected. I just created my first block (account), do I have to do additional steps to start syncing?
Let the wallet sync the entire chain. Make sure you have 4-5 GB free space. For the first time, the complete wallet sync takes usually 2-3 days. After that, the wallet is smooth and the txs will be instant.
The dev team is working on light node. When its available, it will sync fast. The android app is also under development.