Please can someone tell me where to really start?
I'd start by diving into this board and reading every post you see. You can either start from the oldest post or the newest post.
https://www.mumsnet.com/talk/weight-loss-injections
You'll get answers there and answers to questions you haven't even thought to ask. Then reading any other forums online or articles online about how this medication works. You'll find lots of links on different posts and threads while you read on here.
It will probably take you days or weeks to get through all of them but I'm sure by the time you're done (or even before you're halfway done), you'll be itching to get started with a wealth of information at your fingertips.
The best place to order from?
Reading the board might give you an idea of the pharmacy you'd prefer but this website monj.co.uk/ has a list of registered pharmacies to choose from - one list shows discounted prices and another list shows them with full price. Always choose one of the registered pharmacies. Don't be tempted to go to someone on Facebook or anywhere online talking about getting it somewhere else for cheaper. You'll never know what you're getting and if they're licensed to sell.
Is it better to start mounjaro or ozempic?
Reading the board will likely help you make this decision but at this time, most people go for Mounjaro because it generally works better and has GIP as well as GLP-1, as opposed to Semaglutide's (Wegovy/Ozempic) only GLP-1. You should also take time to read up on these - You'll find a lot of information on this board too. However, it depends on the person so Wegovy or Ozempic might work better for you.
Do people switch to different suppliers to take advantage of new customer offers? The price is one of the biggest things that has stopped me starting earlier because we are trying to pay off debt but I need to do something.
Some people do, some don't. If you're happy to go with the cheapest at any time to save money, then you'd need to be chasing the discounts and switching suppliers or go with the cheapest supplier from the start and stay with them until you decide not to. You're free to go with any supplier at any time even if they're subscription-based. You just cancel your subscription and go elsewhere. As long as you have proof of your previous orders, you can start with a new supplier on your current dose, as opposed to having to start on the first dose (2.5mg) again for lack of proof.