Advice for new casual player coming from WoT?

Hi, fellow Cmdrs.
Being in WoT for a long time and tasted a bit of WoWp, thought maybe 2024 is good to try WoWs, lol, so please point me in the right direction.

1. Interested only in casual gaming, tier 5 at most. Really don't want to push higher here and be a liability to the team with bad play in serious matches.
2. To begin with and get a grip with the game, should I start with cruisers or battleships? Please note that I'm interested in German line and doubt I'll have enough time to try other lines. If it helps, as counterparts in WoT I use mediums and heavys.

Hope I'll figure out the rest with help of YT videos. Thank you!