It is possible to have that bonus Keek mentions above.
I suggest having a read over my post here:
viewtopic.php?f=26&t=87643 It covers tweaking, eventing and bonuses from the point of eventing as a novice.
You cannot train a horse from scratch for an event. But it is possible to event on a novice account
Given you want to cover a variety of events, I suggest you specialise in 1-2 breed types, and base your bonuses on those. As a novice you can only pick 5 remember.
Go read the post, it covers most facts xD Any other questions poke back here and ask away