Re: Horse essentials and preparation!
Have it vetted, 5 stage vetting as that is the most thorough as i presume that you are paying a substantial amount if you are wanting a horse to jump 1m20+ courses.
It depends what comes with the horse to what you will need to buy. If it comes with nothing then you will need to buy a saddle, bridle, headcollar and leadrope at the very least. I wouldn't try borrowing a saddle of anyone as people don't like lending their saddles out as they are an expensive item to buy and don't want them getting damaged, unless you have a friend who has one that is willing to lend it to you and it fits the horse.
You could also do with lunging equipment incase you need to lunge at all.
If you already have a pony then i assume you have a first aid kit so you should have the essentials of that covered.
You could do with a seperate grooming kit for each horse.
As the weather changes you will need to buy rugs for winter.
To introduce the horse to your pony have them in the field next to each other but with a fence between them, an electric fence will do the job. After a couple of days they should be fine to put together, just keep an eye on them.
If you are going to keep him at the farm with your shetland then i wouldn't take him/her to a livery yard for a week or two and then take him to the farm as it will be very unsettling for him/her. The horse needs to go to its new home and be allowed to settle in straight away. Don't worry if you don't have everything straight away as you want to let the horse settle in for a few days before starting to ride it anyway.
Good luck and i hope your search doesn't take too long but be warned it can take months to find the right horse.
. .A horse is a thing of such beauty. . .none will tire of looking at him as long as he displays himself in his splendor.