Take it slow, dont be afraid to try new things, watch some let's plays. I watched a Youtuber named StraightOuttaBoston to get into the game. His Rockies series in OOTP 16 and his Rays series in OOTP 18 are really easy to watch and entertaining and will give you a good look at basically all aspects of the game, i learned a lot watching him as a newbie too. Here's a link to his channel:
https://www.youtube.com/channel/UCsX...BffPMYr7Cf0Y7g
There are also some good tips in this reddit thread:
https://www.reddit.com/r/OOTP/commen...and_trick_ive/
Don't be afraid to ask questions on here or on the OOTP subreddit, everyone here is very friendly and welcoming for the most part, I learned a lot from this forum