I just picked up a 45-90 with lots of brass and loaded ammo I reload now so have lots of equipment. Any input on what I need to start up right? what powder primers any specific black powder equipment?

There are so many very personal approaches to handloading BP cartridges that "what do I need" equipment lists can vary a great deal.
Many BPCR shooters use fiber wads between the powder charge and the bullet - fiber or plastic or cardboard - so you may want to get a wad punch that will cut .45/.46 cal wads. IIRC, a 7/16" will work. Or you could buy a bag of 1000 Walter's Wads and be set for a while.
Using a "grease cookie" is also popular - two wads with a disc of beeswax in between. Softens fouling in the barrel.
Reminds me - target shooters will often use a "blowtube" to blow into the breech of the barrel between shots to help keep fouling soft. In it's simplest form, it is a piece of 1/2" plastic tubing about a foot long.
Powder - FFg is standard for that cartridge. I like Swiss brand in my 45-70, though I have no problem using Goex also.
Primers - whatever I have on the bench. Other shooters may be more specific.
There is a school of thought amongst BPCR shooters that leads some to put a "wad" cut from a sheet of newsprint over the primer flash hole to keep powder from entering and to soften the flame a bit at ignition. I do not do this. Experiment.
There is continuing debate about whether or not you need a dedicated, non sparking BP powder measure like the Lyman. I have one, so I use it.
Quite a few shooters use "compression" dies to make their powder compression uniform across their loads. I, more often than not, use unsized cases and thumb seat my bullets - hold them in with a light crimp - so a compression die is of less use to me.
you may want to look into Paperpatching bullets for that cartridge; you don't have to but, again, quite a few shooters do PP their bullets for the big BP cases.
Pete

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"Only hunting and mountain climbing are sports. The rest are just games."

Pete covered it well.To avoid a lot of headaches a compression die would be on the list,you will also need a drop tube.For primers Federal GM210M orCCI BR2.
I neck size,then expand with an M die. I have never paper patched so have nothin to say about it one way or the other.

If you don't cast bullets you need to start.For that you would need lead &tin to make a alloy of lead & tin 30-1 or 20-1.You will also need a BP bullet lube such as SPG or
Eagle. You can pan lube with these or use a lube sizer.You will also need a thermometer, leadpot,ladel & mold.For these rather large bullets you will be much better off concistancy wise to use a laddel instead of bottom pour.
A good mold to start out with would be a Lyman 457132 Postell.
If you get a lubesizer to start out with you will need the top punch for the bullet you are going to be sizing & a .459 die.

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KG0BW Jim

Black powder specific, powder measure and drop tube. Buffalo Arms sells a few different ones.

I have tested the 45-90 and the 45-100 peabody with1 1/2 Swiss 1400,to 1450 fps,with a 545gr postel bullet.using a 1/32 nd. manifold wad.I used Northwoods bullet lube.It is a mixture of bear lard and beeswax.Wont melt in 113 deg. temp.,and wont lead or fowl.Bill Flanagan of Eau Claire Schuetzen tried and tested it at Raton.He got great results.It is a seasonal product from Providence Tool Company LLC.Check there web site and the customer feedback.I also use it for case sizing.I seal my leather boots like the old dubbing compound.Will not hurt your skin. Frank Wierus

Mike Venturino's books are a good investment.

my self i have had phenomenal reselts with black horn power in my 45-70
a less than compressed load has worked the best

This is my trapdoor sporter I tore it apart to redo the stock again. and my drop tube

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