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................I want to start a mailing/emailing list of my clients so Ill be able to either send out emails or snailmail to
Which is the best software to do this in and can it easily be used to send out emails from outlook when needed?
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If you're intention is to send out emails to individual members of your list, then the obvious choice is going to be Outlook.
Beyond that, if your intention is to <only> do bulk type mailings either via email or snail-mail then it would be your choice in terms of comfort zone as to whether you would maintain your list in either Excel or Access but typically Excel is a far easier program to learn/use. If it's a mix of individual emails and bulk emails, then Outlook is probably the best choice.
Your bulk email/snail mail requirements would be done via the Mail-Merge function in MS Word.