skill both affection bonis in your skill tree first.
if u dont want to play the game in the current moment, start the game anyway and send all girls to work. After you unlocked the outer lake area, you can send Luna and Lucy there for more item gathering. they work continues in real time except midnight. just look every 5 minutes in the game and loot the work progress. this is sth like AFK farm. -> unlock headpats ;)
always have an eye on your quest progress, you dont need to rush the girls levels, you can do this with the headpatting - fishing trick i mentioned in my comment above.
always try to use the "action" button whenever talking to a girl. if it works or not is depending on the area you talking to the girl and her trust stats, which are depending on the girls lvl. If it works you unlock secret scenes.
unlock the Quintuplets tasks as soon as possible, the girls map location is really usefull for example (you have to unlock Quintuplets first, just follow main story)
always use "talk" option whenever you have done a new task, they might want to talk about sth, so u get trust stats.
check out the the shower during daytimes at the beach whenever you are bored ^^
The first 1,5 hours of the game are sth like a PrePrologue, its there for the stories lore, just be patient you will get where you want to be, trust me ;)
If you have any other questions dont mention to ask me at any time. That applies to every man of culture out there, dont be afraid to ask .I will support your gameplay as much as i can ;)
If i explained anything wrong please adjust me! THX.