Holy balls this game is not new-user friendly!
Looks like there are loadout items that are single use and some that are permanent? And suits, oh the suits!
Mad, break it down for us, what the hell should I be spending my 500,000 (monies) on?
Yeah, user friendly it definitely isn't. You'll have 3 character slots. Do not pick them with the intention of summoning up robots, turrets, installations and stuff. You can't. The easiest classes to get into right away are going to be Enforcer and Artificer. Artificer mimics the Medic from BFBC2 with starting with a nanoinjector, Enforcer starts with grenades and bare bones combat skills. Both start with Assault Rifles. There is a Heavy Machine Gun class that needs to be unlocked but you can access it with the Militia Heavy Dropsuit(which you will need to buy). As for what to spend your money on, you'll need it to unlock skills. So try to buy as little as possible and use default unlimited Militia equipment or buy the cheaper Militia stuff and use it like I outline below.
Enforcer/Artificer - Recommendations
If you start Enforcer or Artificer, the best thing you can do is immediately switch to the Assault Frontline template dropsuit. It's a blueprint dropsuit, unlimited everything at default. It costs you no money to use it in it's default state. Enforcers can also use the Enforcer dropsuit which comes with nanohives on default, which is also a blueprint suit as well. Artificer dropsuits have less armor than the Assault dropsuits but put out more CPU, the tradeoff is negligible once you start buying your own equipment, so stick to the Assault suit early on.
Ditch the Militia Recharger but keep the Militia Shield Extender on, buy another Militia Shield Extender to replace the Recharger, make sure you have Militia Shield Extenders in both High Powered slots, you only use 1 each time you spawn instead of two. The Recharger isn't as helpful as the extra Shield will be.
Swap out the Stamina Module on the right for a Militia Armor Repair module, this will allow your Armor to repair it's self at 2 armor points a second. Armor is your Health. Shield is Shield. Buy a Militia SMG, they're cheap enough to start using immediately. Skip the Nanoinjectors initially, while they're good to have when you're camped with a bunch of people, they get you killed quick if you run around trying to revive people(I speak from experience). If you can fit the Militia Nanohive you can recover ammo as if you were next to a Supply Drop installation. Plus you regen ammo for your team, it replenishes ammo and grenades.
Try not to buy anything that isn't Militia related early on. You need the money to spend on unlocking skills. Unlock the first level of SMG, Assault Rifle and Grenades as quickly as possible. The reason for Grenades is that it's expensive but the grenades you purchase in the market come 3 to a pack, the Militia ones only let you stock 2 Locus grenades. You can take out light vehicles with 2 Anti Armor grenades that actually home in on the target, 4+ to take out heavy tanks. SMG and Assault Rifle will let you buy the Market(non-Militia) versions at L1 that reduce CPU, PG and up ammo magazine capacity when you get more money.
Circuitry, Nanocircuitry(for the Nanohives), Field Mechanics and Dropsuit Command will be useful. Weapons is a must, if you want a heavy machine gun, you need Weapons 4. If you want a Forge Gun, you need Weapons 5. So all in all, that should cover a decent portion for more than a few matches.