I found a lovely 3 bedroom 2 bath in a good location and a good condition for 600k, I see a vision just like my other property and I can see it cash flowing as well after a few renovations.The one thought that holding me back?

I have 200k in liquid cash (yes this was self earned thru 5yrs of sacrifices and hard work 12-16hr days 7days a week with maybe a month in the summers as break to see family back home, but i dont want to do this forever) My dad and I want to be partners going into these deals. there is a new construction 4plex i am looking to build which will be 775k that i will put 25% down (half me half my dad) which will cash flow net 2k /mo if i rent it out LT (COC of 11% which isnt bad and apparently my agent who recently worked on a neighboring new build said the appraisal after its built is mid/high 800s, also my plan is after 2yrs to REFI at lower rate). i am considering to have 2 of the units as MTR for local nurses or construction crews which of course can increase profits much more. i also have a 3acre property that i am thinking to build small 2bd 1ba cabins and use as STR/MTR/LTR. but i am also wanting to do do STR as i love the concept and have watched Robuilt everyday learning from him. i am looking to buy land in a mountain/ski town (189k 10acres) and build a beautiful aframe and use as a STR. all these property ideas are close by to me so i will have a close look on them and will manage myself. i have just been consuming knowledge endlessly the last 3months in preparation for this decision.but as you can see my head is all over and im unsure what the correct first step will be. i have many goals and visions of what i want to do i just need some help making a correct first decision on those who are far more experienced than me in this real estate space so i use my capital in the most efficient way. i understand real estate is long game and i have no issues with that but i would like to at a minimum cashflow 100k a month by the time im 30. this is a big goal but i have 8yrs to do this. thank you for your help i look forward to the responses(side note: i am not considering house hacking as i live with my family, this will possibly be an option in the future) 

The lending environment may very well have changed by then and instead of a vision you will have execution when you try to get traditional funding.If you have your database from when it was operating, start there. 

So make sure if you partner up with someone they have the same vision.   

Discipline comes into play when those unrealistic expectations become a reality and the vision becomes blurry.

If you DM me I have a tool that helps you think through and craft your Vivid Vision (where you'll be 3 years from now) I just can't share it in the message b/c it has branding to my company. 

The new home owners can then figure out something else if they have a different vision.

some of the peripheral questions @Jack B. is asking:-optimizing your portfolio - potentially selling off either low performing or high appreciating assets, and-diversification into other asset classes?

Throughout this journey I hope to meet a mentor(s) who can help me with my vision to own numerous multifamily rentals to create cash flow, financial freedom, and creating a legacy for my family.

If your goal is long term cashflow and financial freedom than trading in two depreciating assets for one that appreciates and helps you scale towards that 10k vision in the future seems like the right move towards your goals.