On economy:
With latest versions, I'm thinking that the game is very close to a sweet spot. Early economy is mostly loot- and ransom/slavery-based. I've crunched numbers for possible manufacturing options - and indeed, as other people already said, they aren't really practical. You'll be looking at ~1 month building time, ~2 months for 100% RoI on a new base not including monthly expenses, and over 3 months with monthly expenses. And that's the even with the best early option (X-Grog). And of course this means that you're basically delaying your main base progress all the time.
I find it much more important to focus on tactical combat results and training gals so that you'll have your strong "core team". This allows you to cut your expenditure (less dead gals -> less expenses on recuits), have WAY more captures (100% capture rate on missions like Temple Raids is quite dangerous with newbies but extremely easy with experienced warriors), and tackle harder missions which give more loot. Researching all coin-related items allows you to start stockpiling some good coins so that later you can use those with Mint for great profits. Researching captures allows you to enslave those who are applicable, and slaves are required for some pretty good economy-boosting options that will come slightly later.
Expanding for radar coverage is decently viable as well, but doing it too early is ill-advised - it's quite pointless to expand unless you can capitalize on it reliably, and that requires an attack craft good enough for civilian traffic (Aircar is good, but Shark Jetbike is better, as it can easily get 100% interception rate on any civ traffic for very low Hellerium cost), a craft gun & ammo, and an experienced pilot to tackle those missions solo (sending your main team on very small civ crashes is an extreme overkill).
Not to mention that you don't really need to expand for radar coverage for purposes of winning or not losing the game. You'll definitely need more bases after a while due to base grid size limits, but there's not many reasons to speed up expansion just for the sake of it.