"So I like this rp. It looks really cool and interesting, but do I have to read 4 pages of posts so I don't lore break? Also, how can my character enter and not feel like they don't fit in or know way too much?"

Pretty much my thought process. Its possible, but it's not easy considering. 

Summaries help, good gms help, and an explanation of expectations for the future can help too so you have a goal/motive.