No stupid question. At first I just opened the channel with all liquidity on my side. No manual comunication was needed. Everything is automatic. IMHO their node probably only rebalances liquidity on big channels (with nodes like 1ml, bfx, acinq, lnbig, etc) With my channel I had to do all the rebalancing, and pull the liquidity back to my side. I did that by rebalancing using Ride The Lightning application of my umbrel. Another way is to use LNDg, which you can set to automate rebalancing and trigger them under certain liquidity threshold. For rebalancing you need a second channel to compensate, that will move its liquidity to the inbound (the other party) side.