I am new to real estate investing and I have been deep diving into the biggerpockets webinars to learn all that I can. 

Should I start wholesaling by diving right into a deal or should I seek help from someone else?

It's determining what you want/need next that will and should take some deeper thought. 

I have become very interested In diving into real estate by finding a duplex to potentially BRRRR.

Let’s make these other below assumptions:Own20% down payment to avoid PMI (private mortgage insurance)Monthly payment is $980 (principle & interest) + $400 (taxes) + $75 (insurance) = $1,455 per monthTotal interest paid at the 15-year mark = $108,000Balance owed at the 15-year mark = $130,000Mortgage amount is $200,000 ($250,000 – 20% down payment of $50,000)House will appreciate to $330,000Total repairs over 15 years = $37,500Total insurance over 15 years = $13,500 Taxes over 15 years = $72,000 (assuming no increase, which is highly unlikely) Rent Total rent paid over 15 years = $250,000No repair or insurance cost__________________________________Now let’s dive a little deeper into these numbers.

I may stick it out for a year or two and build up some capital before I dive in.

It certainly would be far less foolhardy to offer half their asking price than it would to dive into an unknown money pit!

I would be interested if other BPers know of other deep dive capex articles.

You are a sophisticated investor to scale to 120 units and bought at reasonably lower rates.Nobody can say if this market is going to dive or not and 1031 in another asset may not give the income that u have. 

HOAs, utilities, property management, booking fees, cable, internet, etc. can all add up fast so make sure you do your due diligence before diving in.