First - a smaller press, or one with interchangeable platens, is necessary for kids shirts. The 16 x 20 platen will stretch them out too much.
Next - you may want to use transfers from a company like Transfer Express instead of printing your own. They're plastisol or cadprint (digital printing). The plastisol transfers are just like silkscreened images. You can also get packages of pre-printed numbers in different fonts, sizes and colors, which makes numbering very easy and affordable.
Last - sublimation will only work on light colored, polyester shirts. If a team wants black and silver, that will not be possible with sublimation but can be done with metallic transfers or grey plastisol transfers. So, you may not need a sublimation printer. It'll be easier and more cost effective to use the plastisol transfers.
Next - you may want to use transfers from a company like Transfer Express instead of printing your own. They're plastisol or cadprint (digital printing). The plastisol transfers are just like silkscreened images. You can also get packages of pre-printed numbers in different fonts, sizes and colors, which makes numbering very easy and affordable.
Last - sublimation will only work on light colored, polyester shirts. If a team wants black and silver, that will not be possible with sublimation but can be done with metallic transfers or grey plastisol transfers. So, you may not need a sublimation printer. It'll be easier and more cost effective to use the plastisol transfers.