your economy does look decent however look at your education index it is 120 which is where you want it more or less however look at your sub indexes..... schools and high schools are 120 however the university index is a whopping 232.... you don't need that many universities they are just a waste of money..... gotta keep the sub indexes of the transportation and education indexes balanced or you're wasting money....... rough estimate i would say you need to close 38 universities that save you half a billion dollars monthly with no damage to the functioning of your country..... (you will probably have some university professors that are unemployed that you will have to find jobs as low level workers
WL0 is phenomenally easy to win you can do it with your starting army however it looks like you got rid of it
a basic offensive force that you could use to capture countries all the way up to wl3 would be the following
an offensive anti air division consisting of offensive anti air missile batteries and mid range missile batteries id say 100 mrmb will be enough shielding to take out any c3 air force....... simply attack an undefended target (a county or town) in the c3 until the helicopters stop responding this will allow your next division to do its work
Missiles Division consisting of mid range missile batteries and 30000 MRM or so attack the garrisons of targets (cities, factories, Forts if you have too) you will take minimal losses so long as the helicopter units remain out of commission..... after the helicopters stop responding you may want to consider attacking the helo units directly so they cannot be resupplied.... it takes time at higher war levels but at WL0 there are probably only 3 helo units
while you are attacking garrisons with the mrmb divisions you will want to have a few heavy tank brigades painting the country and attacking/destroying targets that have just had their garrisons wiped out
after you win you will get some cash about 1-2T at WLs 0-3 this will be more then enough to resupply the losses your offensive forces took and leave you with some spending money c3 raiding is one of the best ways to make money...... that is about as basic as it gets right there so if you intend to do more advanced warring with air forces or long range warring or PVP warring you will want to read up on the forums and documentation.... go into chat and consult vets when you have questions
oh yah buy high quality (330 is max) and then upgrade to 450.... this will make your units more durable and able to withstand damage as well as allow them to inflict more damage themselves increasing their survivability and reducing long term costs (you don't have to buy so many weapons to replace lost ones)
Good Luck