I’m still very confused how to get into DVC. How do I convert the points to DVC? Once they do how do I use them to select my resort, room & days? Is there calendar availability before I convert the points?
Exchange is a lot more complicated than you are thinking. It is not as easy as it would be to use DVC points as an owner.
You don't convert to DVC. You deposit to RCI. You can deposit points anytime from ten months prior to the start of the use year through the last day of the use year. You can deposit up to your annual allocation. You can also rent points ($12/K) for deposits if you hit that limit. The minimum deposit amount is 10K. A deposit is a final transaction, and cannot be undone. Your points will be good in RCI at least to the end of the month two years from the date of deposit.
Once deposited, you can then exchange for what RCI has available. There is a fixed grid based on size and season, constant across an area. For Orlando, most of the year is High season (105K for a week in a 1BR), though a few weeks of peak spring break are Prime (126K) and some of the hurricane offseason (mostly September) are lower (77K). Those seasonal designations can and do change.
As a resale owner, you would only be eligible to exchange in RCI Weeks. For most resorts---including all of Disney's---that means 7 days at a time. Disney only deposits weeks starting on a Friday, Saturday, or Sunday. There is much higher demand for them than supply so they go fast; you will have the best luck with an ongoing search. You can start an ongoing search without having points on deposit, but you cannot confirm a match without depositing.
For all intents and purposes, Disney only deposits 1BRs. They are almost all at Saratoga Springs. This too could change, but I wouldn't count on it.
Because you are a TUG Member, you can see the Sightings board. That will give you a sense for what is available and when over time.