I'd like to host an online tournament: where to start?

Hi all,

I wanted to organise a little tournament within my aoe2 players fellows but for one reason or the other they don't feel like they could really commit. I already have a sort of plan with a game mode, map and some ideas for the match setups.

Where would I have to start to organise an online tournmanet? If I have to think of a platform, I'd say HD with expansions (mainly just because I had problems installing WK but I should give it another try). HD ELO maybe <2000, noob-friendly.

I am pretty sure you guys will deliver some awesome feedback, so thanks in advance :)