You can book as many days as your points may allow. On the computer system, you can only do 30 at one time but you can call and add more. The main issue you will have is ultimately booking the entire trip if trying to get a room category that can have issues of availability. You still cannot book more than 7 nights at exactly 11 or 7 nights out. Particularly for the seven night window for another resort, that means if you achieve a reservation right at 7 months out, you could lose all or part of the rest because owners of the resort could get the days after you make that first reservation.
At 11 months out, you should be able to do it as long as you get your initial 7 night reservation at 11 months out; you just need to continuously add days daily, or at least every six days, until you have what you want. However, that still has some risk, e.g., unknown to members beforehand was that the AKV value rooms were to be taken out of service for about December 4, 2019 to January 26, 2020, and thus if you wanted an extended trip beginning in late November, you would have found yourself blocked out from reserving the entire trip even if you started to reserve 11 months out.
As to your avatar, it is a three-click process to get to the box you need to do changes. Click on your empty picture frame until a box comes up, then click on the empty picture frame again until a page comes up, and then click on the empty picture frame again and you should get a box called Avatar Editor and there you can add an avatar photo.