If you go to the resources section theres a lot of free FAA tools and other things that I put together for you to browse through! There is so much public info on the FAA's website. I think you'd like the PHAK (Pilot's Handbook of Aeronautical Knowledge) or the AFH (Airplane Flying Handbook) specifically.

@Ben Hargis Thank you good sir!

@Hari Pilli Thank you! 👨🏼‍✈️

The only place you’ll ever see people getting their multi before is in part 141 flight schools. The short answer is definitely single first and then worry about the add on rating afterward. A little bit of conspiracy here but those 141’s are huge money grabs and from a financial perspective they have students fly sometimes up to 25 hours in a multi as part of the program to get their commercial in that first which is about 9 grand not considering Checkride fee. It never made any sense to me except to get way more money out of you. Your commercial checkride in a single engine is going to be hard enough, it’s completely different. I got my multi at Riggins in SD in 4 hours.. it was awesome, built time for cheap later on to get to my 25 required for ATP minimums. I would say stick to part 61, get single first. There’s absolutely no rush to get multi so fast when nobody’s gonna hire you into a twin until at least 500 hours anyway. Enjoy all that extra money in your pocket.