"...Lee loader..." Not made to go in any press. They only work with a plastic mallet(no steel hammers). You'd still need a scale, calipres, a case trimmer(with a chamfering/deburring tool, powder trickler, powder funnel and a reloading manual as a minimum. Those silly scoops aren't accurate enough(they can vary the powder charge +/- by a full grain) and no load data is given in CC's. A Lee Loader will turn out decent ammo, but slowly and they neck size only. Neck sizing is ok in your case though. Neck sizing is for bolt action rifles using brass fired out of the same rifle, only. New brass or once fired in another rifle must be full length resized first.
"...given me a press..." Which one?
Buy a copy of The ABC's of Reloading. Read it cover to cover. Then look into buying the rest of the required kit. Or just buy an RCBS Beginner's Kit. Comes with everything you'll need less dies and shell holder. The included Speer manual is ok, but only has data for Speer bullets. Buy a Lyman book too. RCBS' warrantee is on the kit, not the owner. Have any problems, even if you caused it or bought used, and they'll fix it, forever, with a phone call. They'll ask for your mailing address and nothing else.
At the very least, look on RCBS' site for what comes with it. You'll need all of it. Buying used is ok, but you'll end up spending more money. Takes a lot of abuse to damage modern loading kit.
"...Lee's reloading equipment compare to RCBS..." Lee kit is low end, entry level, stuff. RCBS's kit is the standard. Lee's warrantee isn't as good as RCBS' either. Dillon's is the same as RCBS, but their kit is considerably more expensive and not entry level.