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You don't need hyper rolling strategy to be no 1, so don't spend money for gold units.
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Early game try to make a strong 2 stars units (such like 3 wooden + 2 druid or 3 predators or 2 rangers + 3 inferno + 1 any tank or 3 shadow + 1 tank etc). Watch Scara and Disguised Toast's streams to learn how to combine units and items.
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Once you got your early game comp (2 stars) start to save gold to make interest at least 40 gold. I suggest 50.
The important thing is to resist till you got that gold interest.
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Level up till 7-8, meanwhile build the second comp for late game and use them when they are 2 stars. At level 7-8 you can migrate from early-mid game comp to late game comp.
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To have better chance to make 2 stars tier 4 units you need level 8. Once you reached lvl 8 you can hiper-rol to upgrade you units (specially ADC/APC or tank).
For late game comp I suggest to try 4 Ocean + 3 mage + 2 Mountain + 4 Warden / 2 Mystic (depend on your opponent): Brand (main APC), Syndra, Taliah, Nautilius, Thresh, Malphite (main tank), Vladimir (replace with Nami), Janna or 1 more Warden (depend what kind of dmg has your opponents AP/AD).
IMO the best early-mid game comp is 2 Ranger + 3 Inferno + 3 Shadow + 1 tank such like 1 any tank, Kindred, Varus, Zyra (replace with Annie), Malzahar, Veigar/Sion.
Late game transfer AP items from kindred to Brand and tank items to Malphite.
If you go this comp than start to grab Tear and Needlessly Large Rod from first 2 carousels to build Seraph and Rabadon for your main APC.
If you get the most important item Neeko Help use it on your main late game ADC/APC to upgrade him to 2 stars. If he is already 2 stars then use it on your main tank to upgrade him.
To protect you main ADC/APC from assassins, place 1-2 secondary tanks behind him, this means your main ADC/APC will be on the second row, middle, practically he will be surround by your units.
CC, tanks and 1 main ADC/APC rules in TFT and LoL.
Good luck :)