My personal advice... is research research research.
It costs $ - depending on what you have.
For example:
Grain mill? You going to buy bags? Or have the LHS do that for you mill it for you?
Pot? - If you are going to built a MLT and do AG you might want to think about the extra investment and jump to 10 gallon batches at the same time. I got a 15 gal pot and sometime when I do a 90min boil wish I had a 20 gallon pot.
Chiller? If you move to 10 gallons you def need one that works really well. I built myself a pre chiller as well for the hot summer days.
Sparging? You can batch sparge - think about where you are going to collect and where you are going hold your hot water? You might need an extra bucket or another cooler - I person like fly sparging - just a personal thing so I have a cooler up top for my HLT.
just throwing it out there. I am so glad I did it. I enjoy the process so much more. But again I would research and decide in your space what kind of setup you want.
I am the type to get frustrated if I do not have the right tools to do a job. So that is my advice... For what it is worth. I have only been brewing about a year.. so I am newb at this ... but I went from 4 extract batches right to 10 gallon AG and very very pleased that I did.
Have you checked out Bobby M vids? You can find his site
here. There are plenty of others on here that have great advice do not get me wrong.. but his stuff put me over the top and help me get a handle on what I wanted to do.
And a visit out to Ed's Ranch was extremely helpful in my young days as an AG brewer... He was able to sample my 2nd batch (used his Haus Pale recipe) and he was extremely helpful with points and advice.
I am out.
T$