Keep those things in mind, but build the team the same way every team should be built. Gather talent as it comes, in the order that is the most obtainable. It is the same in every world. Above rec middle of the field players are among the rarest, SS/CF will be in high demand world wide, so pay out the nose for them when you see them, if you can. Starting pitching the same, get the best you can, and go for SP/SS/CF first if you can. COF/3B/1B are pretty easy to obtain, as you have the built for the position guys as well as aging former CIF guys that can play those positions as their ratings start to decline, they will be a little less expensive, and in lower demand, making them easier positions to fill. The hardest position to fill with a difference maker is C. You can find a hitter there, or a defender there, without much problem...but to find both in one guy will be very rare, and expensive when he arrives.
I rarely draft/sign 1B, 3B and LF/RF if I can help it. Those positions are easy to fill with ML guys. Draft and look for C/SS/CF/2B types that are stars, they will make the core of the team in the future. Pitching is always in high demand, and in that ballpark velocity/control is the teller, other than the other ratings as well, and you will want to get the best you can. Concentrate on SP, as relievers are also pretty easy (and cheap) to find and sign. SP and SuA is what you want.