That is awesome! Please make sure you wrote down your seed phrase and have everything secure. 

You are correct, first thing is to fund the on-chain wallet. This depends on what is your goal of this wallet?

If you just need a wallet, for small purchases i think 500k-2m is a reasonable. just remember that you need to have a little bit more in the on-chain wallet than you intend to have in the lightning channel. 

If you use Telegram, I suggest you find Nodstrich  nostr:npub1hxfkcs9gvtm49702rmwn2aeuvhkd2w6f0svm4sl84g8glhzx5u9srk5p6t and join. I can help you there and many others can provide even better insights.