DotA2 - Original Thread

First battle first won
YAY

That's a... custom build? I made for Warlock.

Well done. It's not really custom but limited hero pool with just new player friendly heroes.
When building items is better to start little by little, so that you have stuff throughout the game.
Usually, and depending on lane, you start with Tangoes, a salve or two and 3+ branches depending on what you need. What this provide is a lot of regen so that you can stay in lane as long as possible. The branches give you stats that help with last hitting during early game. Building boots after that is a must because it gives you speed needed to either chase or escape. You don't need to buy power treds/mana boots/ tranquil boots right away, you could start with just Boots of Speed, get some other items and upgrade later. Also, having one TP scroll at all times is a must.
For 35min game your last hits are ok. Much much better than what I used to get when I was just starting. What helped me improve last hitting a whole lot was turning auto attacks off.