I'd like to develop a more solid plan to maximise building wealth.

There is no point in a investor not maximising there returns when facing under market rents.

This isn't just about achieving ROI but rather looking at the bigger picture – how your investments are performing relative to your original investment (ROE) and maximising this for future success.

That is a major mistake new investors make...they over improve and over spend.Never get attached to a tenant, get attached to maximising profits.

I have heard a lot of people using LLCs and Partnerships as bussiness entities to maximise tax advantages and security my question is what are they, how to form them and what are the advantages?

My first property I purchased with 100% financing, I have never regreted maximising my returns.Some investors have no options if they purchase properties worth less than 50K, financing is nearly impossible.

Yes, it's true that you can maximise your gains by buying under market value.

My current strategy is to maximise equity over cash. 

If you are planning to sell it I would advise finding a local land (not residential) agent who can help value the property, choose the best lot, and maximise its value.

As Rentberry says in their pitch to landlords: "We strive to maximise your rental price by allowing tenants to submit custom offers and compete in the bidding process."