What i am thinking is buy the wetsuit i found a custom to fit 1.5mm for 263 210 for a 5mm for cold water if i buy it within two months of the first one. Not sure it i will or not.
Most of that stuff i think is size set so might need it before i get cert.
Where do you plan on doing most of your diving?
IMHO- I would not waste money upfront for a 1.5mm- It doesn't offer much warmth and really is just a rashguard. If you plan on doing a lot of tropical diving then buy it, but you could probably just go bareback. If you plan on doing most of your diving local, I'd opt for the 5mm to start. remember if the suface temp of the water is 75, at depth it could easily be 65.
Although B/c's are size set, BUT the sizes are general, s,m,l,xl,xxl and are adjustable. I'd be surprised if your diveshop did have all these sizes availble for rent- ask them if sizing for you would be a problem if your hesitant before buying. For example, I can fit in a large or an XL pulled tight- there is much more play in B/Cs than wetsuits