Hi guys,
Im new here, first post

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So i got my first Leo today, and just have a few questions.
Ive got him/her in a plastic vavarium with a heat matt on one side, i have a log for climbing and a cave for hiding, and obviously a water bowl with a little section that ive put some Nutrobal in for his/hers calcium substitute.
Im just a little concerned about what ive read about the substrate im using, Its a medium woodchip, my friend who has 2 Leo's uses it hense why i got it, and i bought it today from a reptile centre lol, so im not sure as to why parts of the web say to avoid it :s.
Again is there anyway to determine age??? as i have no idea i also need to get it sexed.
Feeding wise ive been told to drop 3 locust in per day, but obviously if he/she hasnt eaten the meal from the day before then dont top it up.
Any information for me as a beginner with this stunning reptile would be fantastic, as i dont want to make it ill or worst case scenario.....kill it

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Thanks in advance.
Griff