Hi Harry,
1) Each web hosting plan and each website builder is for 1 website. For web hosting, you can start with the Deluxe 1000 plan and upgrade if necessary. The process to upgrade to the next plan is very easy and does not require any migration of content - we just add resources to your plan. The web hosting and website builder are connected to the domain name you choose.
2) UltimateWB Full, or Ultimate Web Builder Full, is the software which you can purchase, download, and install on a web hosting plan/server. UltimateWB Cloud plans include use of the website builder and web hosting, but your website content is not downloadable, unless you switch to buying the website builder. So, UltimateWB Cloud plans are similar to hosted website builders. Either way, we include SSL free with our web hosting plans and UltimateWB Cloud plans, so you do not need to add it.
If you choose to buy the software, you will need to buy hosting as well, either from UltimateWB, or a web hosting company that satisfies the server requirements. When you purchase web hosting from UltimateWB, we install your purchased software on your web hosting, so the process is really easy for you - after setup, you just login to your website admin panel to start building your website. Similarly, with UltimateWB Cloud plans you just login to your website admin panel to start building your website.
3) UltimateWB purchases are usually processed and set up within 1 business day. We do sometimes do setups during off business hours and the weekend/holidays.
The setup process will require you to point your domain nameservers to our servers. We will provide you with the nameservers. Usually the connection is very quick, but sometimes, depending on such things as your domain registrar, it may take up to 24 hours to connect. In our experience however, the process has been very quick.
Hope this helps!
David