Once given a date of joining...they will test your patience....just be optimistic. As the future is so bright you'll have to wear shades
lol
Really have to be patient and just give them whatever they ask, mostly documents you already have...but might have been kept in the garage...
Background check that might take a month or so depending on how fast you can comply with their needs.
Also medical checks (depending on your fitness-of course), pre-medical results may be approved or re-test done if any.
They will assist you throughout this process of documentation-mostly to make sure your license/medical/etc is valid upon joining...(took about 3 mos.)before joining, since I did ask for a 3mos notice. If you asked for 30days, then you should be able to provide everything they ask for in that time frame.
My suggestion is just to go with the flow...so to speak.
StPeter