Anyone going into this expensive pastime should ask themselves the question of what they want out of it. If it's a profit, seek immediate help.
Other than that, if you want a say in what happens then consider starting your own group where you are the contact with the trainer. If you want to see the horse regularly, go local. If you want success, go small in a proven operation (and hold your breath). Whatever you do, set a budget and write it off before you start (not unlike betting really). I've done most of those over the last 30 years and the main lesson I'd pass on would be that, whoever is your contact, whether it be syndicate leader or trainer, you have to trust them absolutely because you sign over your rights to them at the start.
If it works it's very rewarding and the day of your first winner is one you will never forget.