...ones they start growing anyway!

So now i have planted my garden im worried about birds and bugs getting in there. I have NO idea what i need to worry about, what bugs can i expect....Wondering if i should put some kind of net over the garden to keep the birds off....there are LOTS of birds in our garden! and scrub turkeys. Dont want to use chemicals and know i can spray with garlic etc. I have companion planted abit.

Any tips??