what must i do to loan youths?
Offer them myself?, sending them to a feeder club?,or waiting for a team to make a loan offer?
Well, yes, all of those...
It depends what you want. If you list for loan, you have to take what you get in terms of offers, if you send to a feeder club you have a bit more control but you won't get any money or salary contribution in case that happens to matter. Feeder clubs tend to not be very advanced, so if you want a higher level of play you probably have to wait for offers (here's where the leagues which have their 'B' teams play in a real league competition are nice - like Spain - you can get your younger players real competition even in your own organization without having to go to loans). Not sure what you mean by "youth", in some (all?) places you can't loan players who are on a youth contract. For players who are a ways along but need seasoning, be picky about your loan offers. There are no guarantees anyway, but I favor offers where the club feels the player could "become a valuable member of the first team" over ones where they might "provide cover for the first team". Of course the player has to perform to get playing time, but unless it's a player you prefer to get rid of eventually, why send them somewhere else with an intent to sit on the bench?
Actually feeder clubs can be really good if you are playing for a top club. For example in my MU save file I have FC Twente and Rangers as my 2 best feeders and they btoh play in the European Champions league. Some of my youngsters have played in at least one of those clubs and played in European tournaments at the age of 19 or less and have become world class, for example an English striker of mine, coming from the youth product, became a world cup hero when he scored a hat ttrick in the world cup final of 2014 when England was losing 2-0 to Mexico. Look at my "Future England and Manchester United" stoy, it shows what feeder clubs can do to players.