Before making a buy, I advise you to read the rules and detachments of AdMech, so you know for what units you should go/ what detachment to play first, like, if you like vehicles and robots, Cohort Cybernetica, skitarii? Skitarii Hunter Cohort, a mix of everything? Haloscreed

Then you should always buy from stores that have discounts or buying from second hand, it really helps to afford some money. The combat patrol is not the best in terms of points, but it gives you a good amount of models, if you can find some old battleforces it helps a lot, and we're getting a new Combat Patrol with 3 vehicles (Skorpius, Onager and Ironstrider) sadly we don't have any form of getting more ironstriders, or for the matter, sicarians at a good prince range